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Old 12-04-2012, 11:22 PM   #15
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switz, what happens when one tire blows out, say, on a curved downhill 10% grade?

That's why I don't like static measurements, and prefer the maximum load the ties can provide.

Softer ride is desirable as well, but Airstream does recommends 80 psi in my 16" Michelins, same as on Eddie Bauer.

doug k
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Old 12-05-2012, 04:33 AM   #16
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Airstream always recomends the maximum pressure for any tire they install. That is because lawyers study so much about tires in law school.

If you run 80 PSI in those 16" tires you are going to really shake the Airstream badly and if you have to make a panic stop in the wet they will have almost no bite.

Your foot print on the road in square inches is roughly the tire load divided by its PSI. So you if you have 1600 pounds on a tire with 80 PSI in it you only get about a 20 square inch contact patch.

The best way to determine tire pressure is to get your actual axle weights. Many truck stops have scales that are divided into sections. Park on the scale so your tow vehicle front axle is on one section, the back axle on another section and the trailer axle on a third section. Once you know your weight per tire you can check load inflation tables for the correct pressure to carry. A tire will be more reliable, ride smoother and have more traction at the correct loaded pressure. Goodyear's RV section has most of the tires used on tow vehicles and trailers listed. Toyo has one with almost all the other sizes.


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Old 12-05-2012, 06:38 AM   #17
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I run them on my 31ft Classic Limited since we blew out a GYM and did $7k worth of damage. We love them. I will probably go to a 16 inch when we start to pull the trailer more often. For now.....what I have makes me feel better than having a set of GYM back on her :-)
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Old 12-05-2012, 07:01 AM   #18
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Well put switz,that was my way of thinking when I decided to go with the 15's.
My temp readings have confirmed it was a good choice for my Safari
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Old 12-05-2012, 08:25 AM   #19
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I have a 25' Excella. Gross weight rating is 6800 lbs. When I weighed it hooked up and loaded on 2 different trips we had 5800 lbs on the axles. Half full of fresh water and fairly empty on the holding tanks.
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Old 12-05-2012, 08:33 AM   #20
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Quote:
Originally Posted by dkottum View Post
switz, what happens when one tire blows out, say, on a curved downhill 10% grade?

That's why I don't like static measurements, and prefer the maximum load the ties can provide.

Softer ride is desirable as well, but Airstream does recommends 80 psi in my 16" Michelins, same as on Eddie Bauer.

doug k
What happens in your tv under that same scenario?
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Old 12-05-2012, 09:18 AM   #21
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Quote:
Originally Posted by Bob4x4 View Post
What happens in your tv under that same scenario?
It did and I'm still here.

The point is on the truck the weight was not placed on the other tire on that side, it just fell to to ground. So the remaining tires were not overstressed and all stopped fine.

But on the trailer if one tire blows, the weight is placed on the tire next to it. So my thinking is, why not have that remaining tire at its maximum load capability?

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Old 12-05-2012, 09:37 AM   #22
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What about black and gray water

All of the conversations about tires and GVW prompted me to do a little math using my trailer numbers.

39 gallons of fresh water @ 8.345 pounds per gallon 325.5 pounds
39 gallons of black water @ 10 pounds (guessing here) per gallon 390 pounds
37 gallons of gray water @ 8.5 pounds per gallon 314.5 pounds
6 gallons in water heater @ 8.345 pounds per gallon 50 pounds
2 gallons of water in the plumbing rounded up 17 pounds

The total weight of the water appears to be around 1,097 pounds in the worst case scenairo.

The Hensley hitch head estimated at 140 pounds

This brings an estimated load to 1,237 out of the factory spec no options payload of 1,748 pounds.

Thus to be legal if all the fluid tanks are full, "my stuff" must weigh less that 511 pounds.

My Stuff includes the things that tend to remain in the trailer at all times such as second TV, tools, wheel chocks and pads, solar panel, Centramatics wheel balancers, Dish TV antenna and control box, bedding, dishes, pots and pans, flatware etc. Thus, the real available weight for clothes, food and personal items could be under two hundred pounds.

I hope to get the trailer to the scales soon to get it's "current" empty weight. The tongue scale I have shows about 1,150 pounds tongue weight.

Thus if there is no dumping station before hitting public roads and the tanks are full, then payload is a lot less. If I can off load the black and gray water before hitting public roads, then I gain just over 700 pounds of useful load or additional less weight on the tires going down the highway with a resulting gain in safety factor.

Do most folks plan "their stuff" payload weight based upon empty black and gray water tanks?

This has an impact on tire selection as well.
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Old 12-05-2012, 02:15 PM   #23
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Are your black and gray holding tanks really that big?

Perry
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Old 12-05-2012, 02:29 PM   #24
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Perry, yes, those are typical tank sizes for newer trailers; mine being a 30' has a fresh water tank that is larger -- 55 gallons.

Switz, there is absolutely no substitute for weighing the trailer on a scale. I have checked periodically and know that with my rig and the stuff I usually carry I'm not going to break 8500 pounds.
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Old 02-06-2013, 04:30 PM   #25
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I would like to weigh my trailer, can you give me some tips? I would to weigh the tounge, total, and hook-up. At $8.00 per weigh Its close by and slow now until potatoes are harvested.
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Old 02-06-2013, 08:19 PM   #26
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15" 235 75

Following the lead of others on this forum I put a set on a '72 Excella 31' empty with Centramatics with "axle sag" (That was a wrestling match !!) and towed 175 miles+ @ 45PSI with no problems or complaints. This was my maiden trip towing AS and I was delighted with the handling and road feel.I could feel the AS suspension through the TV. I parked at the lot and inspected the interior to find evidence of a rough ride,the kitchen drawer full out,but no signs of damage (from this trip). I could tell the AS was bottoming on some bumps so a call to Andy at Inland was completed on Monday for an axle upgrade.
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Old 02-07-2013, 03:43 AM   #27
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Weighing a trailer?

You want Chapter 4 - RV Applications

RMA: Tire Service Professionals
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Old 02-18-2013, 04:58 PM   #28
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Are you still happy with your LTX235/75r15 looks like I will have to go this route, I had bought 16" rims with 0 offset like airstream says, didn't buy tires yet just got a used 225/75r16, but they don't clear at the bottom I need about a 4" or 4 1/2" back space, I have a 72 25' tradewind, looking at next option

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