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Old 11-04-2020, 06:02 PM   #1
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Front Jack Slips When Unhitching

Hi,

As a newbie, I'm still getting the hang of hitching up and unhitching. I'm always shocked at how much my truck (f-250) shifts forward or back once the ball is released. Likewise my Airstream (Globetrotter 25FB) shifts/slips too.

I chalk the tires of the airstream before unhitching. I then lower the front jack and make sure it's right in the middle of the yellow blocks I use. I removed the equalizer bars, chains etc and then lower it, unlatch and then raise the Airstream up and eventually above the ball. I fear the shift one time will be so much that the jack leg slips off the pad. Attached is where the jack leg ended up after the trailer and truck detached from each other...

How can I avoid this from happening? What am I doing wrong?

Thank you in advance.

Scott
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Old 11-04-2020, 06:16 PM   #2
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This works for me 99% of the time:

Once you are in the site, check that your rig is level side to side, add blocks (or not) as necessary. Then chock the wheels of the trailer, tight. Remove the sway bars if you have them.

Jump back in your tow vehicle and put it in neutral ó your tv should move just a skosh fore or aft, taking the tension off the ball. Set the parking brake, tranny in Park.

Now raise the trailer off the ball. Usually, it will just slide right off without any drama.

Unless strangers are watching ó then all bets are off...
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Old 11-04-2020, 06:21 PM   #3
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https://www.harborfreight.com/solid-..._q=wheel+chock

four of them would do the job.
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Old 11-04-2020, 06:24 PM   #4
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What kind of chocks do you use?

I have a double axel trailer and I use x-chocks. Iíve only had my trailer shift when I was on a small hill.

Iíve had my truck shift dramatically when unhitching if the truck is on a different elevation than the trailer (a small incline/decline).

To avoid any sort of movement I try to unhitch in places that are as level as possible, but thatís often not an option.

I hope someone with more knowledge and experience can offer their perspective, as Iím interested if there is a better way of doing things.
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Old 11-04-2020, 06:42 PM   #5
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What n2916s said x2.

I also place the jack plate a tad bit back on the block, so if it does move forward a bit, it's closer to center.
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Old 11-04-2020, 06:44 PM   #6
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Use chocks

Don't set the TV parking brake when in gear. Release trailer and vehicle hitch tension roll for ward & back, put the vehicle in neutral, hold the brake pedal, set the parking brake then put it in park.
The P brake should hold the TV. Pressure on the transmission pall is what can cause the jerk.

Bob
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Old 11-04-2020, 06:54 PM   #7
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Whe have these:
https://www.amazon.com/BAL-28005-Del...vwebnetwork-20
and have never had any slippage. They work well when one side of the trailer is on top of leveling pads and a standard wheel chock can not be used.
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Old 11-04-2020, 07:03 PM   #8
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I leave at least one of the safety chains hooked up until unhitched just to be sure the trailer won’t roll away.
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Old 11-05-2020, 10:43 AM   #9
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The reason you are having this type of slippage is because the AS is on a slight slope and your chocking is not hard against the AS wheels - to stop this from happening make sure you:

a) chock a wheel both sides so the wheel is cradled this way it cannot roll either direction (minimum)
b) since you have a double axle AS chock at least one wheel both sides of the AS both sides a wheel, again this will stop the AS from rolling in either direction.

THe reason your TV is moving is because the AS is stopping it so when the hitch exists the ball the TV moves until the transmission locks. The way to prevent the movement of the TV is to set your "parking brake" - the TV will not move then.

See crude sketch
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Old 11-05-2020, 10:43 AM   #10
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Do not use the blocks...
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Old 11-05-2020, 11:05 AM   #11
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Quote:
Originally Posted by harryk View Post
Do not use the blocks...

what do you mean? for the jack or the tires? I am guilty of using few words.

I use Lynx blocks under tires if need and always do that under Stabilizers. I bring my own 6"X4" Redwood block for jack. I used to use Lynx blocks for jack but it seem to have potential to slip on Lynx caps. https://www.amazon.com/Tri-Lynx-0001...%2C215&sr=1-12

I always use rubber wheel chocks which works better than plastic ones. If one tire has to be raised, I tend to add enough Lynx blocks to allow room for rubber chocks.

As for double axle, chocks do work, some prefer to use BAL scissor type chock. We like to do what is easier and yet safe for us to use. I do not have double axle but I might get the Bal Scissor chocks when I have a double axle.
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Old 11-05-2020, 11:11 AM   #12
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Be sure you chock both sides.
Your picture indicates one side moving.
I like these

Since they prevent the tires from rolling.
But any chocks should work as long as both sides are chocked.
If one side is raised on yellow blocks, the triangle chocks won't grip the ground, though.
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Old 11-05-2020, 11:17 AM   #13
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ortsa

I agree with the post above mine. I hook up the BAL Deluxe Tire Locking Chocks between the trailer wheels on both sides before I unhitch the trailer. The chocks will prevent the trailer from moving after it is disconnected from the trailer.

https://cdn11.bigcommerce.com/s-b889...=2?imbypass=on
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Old 11-05-2020, 11:22 AM   #14
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????????????????

I thought the OP was getting the trailer/TV movement when he un-hitched on level ground.
IOW's....His jack is on the ground, he lifts the tongue off the ball and the trailer/TV lurches.
That is caused by lash-up tension.🤓

Bob
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Old 11-05-2020, 11:44 AM   #15
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As an aside, I made a block for under the jack.
12" x 12" 3/4 plywood on each side of a frame of 2" x 4" on edge, plus one in the center. That gives me a 5" thick block that's a foot square. I added a handle and rope pull so it's easier to pick up. It ain't pretty, but it's functional, not slippery, and bigger.
Next one will have a 2" x 6" frame so it will be 7" thick. Any more and it won't go under the jack foot.
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Old 11-05-2020, 12:07 PM   #16
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[QUOTE=Halford1;2429708]what do you mean? for the jack or the tires? I am guilty of using few words.

......


Just a guess, but I think HarryK meant don't use such a tall pile of blocks under your jack. We use just one "lego" - if jack does slip off, it will only drop about an inch.
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Old 11-05-2020, 01:22 PM   #17
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Set the Parking Brake/Chock the trailer

Quote:
Originally Posted by ortsa View Post
Hi,

As a newbie, I'm still getting the hang of hitching up and unhitching. I'm always shocked at how much my truck (f-250) shifts forward or back once the ball is released. Likewise my Airstream (Globetrotter 25FB) shifts/slips too.

I chalk the tires of the airstream before unhitching. I then lower the front jack and make sure it's right in the middle of the yellow blocks I use. I removed the equalizer bars, chains etc and then lower it, unlatch and then raise the Airstream up and eventually above the ball. I fear the shift one time will be so much that the jack leg slips off the pad. Attached is where the jack leg ended up after the trailer and truck detached from each other...

How can I avoid this from happening? What am I doing wrong?

Thank you in advance.

Scott
I agree with others who recommend setting the tow vehicle parking brake. We keep the parking brake on until the trailer is fully chocked and then the hitch is elevated for release.
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Old 11-05-2020, 02:23 PM   #18
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I second this.

Quote:
Originally Posted by Adventure.AS View Post
I leave at least one of the safety chains hooked up until unhitched just to be sure the trailer wonít roll away.
I remove the chains only after completely unhitching. I level side to side then chock the wheels and use the X Chocks and have still had my trailer lurch backwards. Scared the bajesus out of me.
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Old 11-05-2020, 03:51 PM   #19
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Quote:
Originally Posted by Mollysdad View Post
Be sure you chock both sides.
Your picture indicates one side moving.
I like these

Since they prevent the tires from rolling.
But any chocks should work as long as both sides are chocked.
If one side is raised on yellow blocks, the triangle chocks won't grip the ground, though.
This happened to me twice as I gained experience.

This product will eliminate that happening again. Buy 2 of them today.
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Old 11-05-2020, 04:27 PM   #20
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Somewhere I read/heard that raising the tongue after applying the x-chocks is not good for the tires. Can someone comment?
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