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Old 08-04-2015, 08:51 AM   #15
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I found a product Hide A Spare that looks like it can work under the floor behind the rear axles. Has anyone installed this? Here is some info.

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Old 08-05-2015, 12:01 AM   #16
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It might be fine, if your trailer is higher than my 31', other wise it will be close to the blacktop....
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Old 08-05-2015, 08:43 AM   #17
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Having weighed my Classic trailer's individual wheels, I found that fully loaded for camping that the tire with the most weight was carrying about 2,080 pounds. That got me thinking that perhaps a spare could be a much thinner tire since the actual weight carried is much less than the main tire rating and would allow one to limp to a tire store without overloading the other inflated tire.

One reads that if the tailer is pulled on three wheels, one might be wise to put two new tires on that side as the solo tire has been overloaded. In our case, the solo tire would be asked to carry over 4,100 pounds versus the 2,680 pound rating of our Michelin LT225/75R16/E LTX M/S2 tires or the 2,540 pound rating of a stock GYM ST225/75R15D.
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Old 03-07-2017, 09:24 AM   #18
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Originally Posted by TRIPPPIN View Post
I found a product Hide A Spare that looks like it can work under the floor behind the rear axles. Has anyone installed this? Here is some info.

BAL - Innovative Products for the RV Industry
I hope to be travelling a lot more in the near future and since I got 5 new Michelins for free on a recall I thought having that spare could save me. I finally went ahead and installed the spare under the floor using the BAL 28216 Hide-A-Spare Tire carrier. I had to cut off the top of the frame bracket on one side and add a piece of angle to mount it under the frame. The hinge side mounted to the side of the frame under the steps. The tire is snug to the Belly pan and should not be a problem with road clearance. They have several models including some for enclosed underbellies so I picked one that would require the least modification. I don't know the impact of tongue weight yet as I only compare "loaded" weights and we have not been able to travel this winter.
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Old 03-07-2017, 10:09 AM   #19
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Interesting idea, could you post a photo? We increased our front battery weight this season with larger AGM's, and carrying a little more tongue weight than I like or need. I'd like to see a little less tension on the w.d. bars and still get equal loading on our truck axles.
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Old 03-07-2017, 11:50 AM   #20
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Careful: more weight on rear increases sway.
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Old 03-07-2017, 12:27 PM   #21
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Careful: more weight on rear increases sway.
More weight on the rear moves the center of gravity aft. If the weight was heavy, or positioned far back from the axles, it may be a concern. But here we have about 60 lbs mounted near the rear axle on a 7000 lb Airstream that is heavy in front by design. For example it would have far less effect than moving oversize batteries aft or using the Airstream Fiamma bike rack, which Airstreamers have done routinely.
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Old 03-07-2017, 03:23 PM   #22
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I will be back to the trailer in a couple of days and will get some pics.

My loaded tongue weight was 840 lbs without the spare mounted in the rear (removed completely at that time) and loaded gross 6400 lbs so I am OK in the recommended 10-15% tongue weight range. I am still working on reducing tongue weight because any extra cargo we may carry will likely go forward where most of the available storage is now and these changes give me more flexibility. I am underweight on TV loaded axle weights too.
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Old 03-09-2017, 02:00 PM   #23
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Here are the pics of the BAL tire carrier mounted to the side of the frame under the steps of a 2012 25FB EB. The opening side is the street side and is bolted to the frame with a piece of angle. You drop it down and it slides out from under the trailer then you unbolt the spare tire from the carrier.
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Old 03-09-2017, 05:59 PM   #24
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Thanks for the excellent photos and nice modification. Sometimes after years of travel all over the country and never having a tire issue, I think we could do fine leaving the dead weight spare at home and carry something more useful, using the old three-wheel Airstream method in the rare event of a flat.

But this modification is satisfying to this of us who may want a redundant system and frequently travel far and remotely from home. With oversize batteries already and we're thinking of mounting our Honda 2000 generator above the battery box, this is a decent upgrade.

Our Airstream usually loads to about 6500-6800 lbs for travel; we need no more than 700 lbs on the hitch for positioning the Airstreams center-of-gravity to reduce the effects of sway inputs, and our ProPride hitch needs no heavy weight its sway control system. This underbody tie mount looks like a good option.
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