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Old 02-17-2017, 12:48 AM   #21
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Join Date: Oct 2008
Location: North Vancouver, British Columbia
Trailer: 2009 Escape 17B - "Toad". '08 Toyota RAV4 V6
Posts: 10,338
I think most of the trailers are not owned or attached to the semi in any permanent way. Owner/drivers wouldn't have any incentive to add the tabs to trailers they don't own and owners of the trailer aren't going to concern themselves with mileage.
That said, I think you'd have to own a wind-tunnel to figure out where to place them and if you were saving fuel.

2009 Escape 17B "Toad"
2008 Toyota RAV4 V6 Sport
North Vancouver, British Columbia

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Old 02-17-2017, 12:52 AM   #22
Join Date: Sep 2016
Location: Redwood City, California
Trailer: 2017 Escape 19
Posts: 43
The trick is that aerodynamics are complicated and often unintuitive. Tiny details matter a lot - it can be really hard to guess whether a car's aerodynamic or not based on the general shape. For example, Mythbusters found no improvement in MPG from tonneau covers, and driving with the tailgate down was worse than leaving it up. A current-gen Audi A4 has a slightly lower coefficient of drag than a Prius, and a lumpy/angular GT-R is more aerodynamic than the sleeker Toyota Supra. Without a wind tunnel or at least a lot of CFD simulation, it's basically sheer luck whether something like airtabs help or hurt in any given application.

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Old 02-17-2017, 11:17 AM   #23
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Join Date: Jan 2014
Location: North Van., British Columbia
Trailer: 2014 Escape 19
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Originally Posted by dfandrews View Post
here's the post by Ron in BC showing the rigid insulation/ Sheet metal install:

Adding underfloor insulation

edit: upon re-reading your post, Ron, it appears that the painted-but-smooth insulation is exposed on the bottom of the trailer.
Do you have any update for us about temperature/comfort differences on the interior?
Funny you should mention that mod. I was going to comment on it when I posted photos of our Baja trip.

The first night, in Kalama WA, parked on 6" of snow , convinced me that the mod. had been worth doing. I've only done the front half so far. I'm convinced, walking around in sock feet, that we could feel the difference in floor temperature. It stood up to all the rock and gravel roads just fine with barely a mark on it.

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Old 02-17-2017, 04:46 PM   #24
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Location: Ventura County, California
Trailer: 2015 Escape 17A - "The Pullman"
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That's good news, Ron.
Having crawled under the trailer the other day, I found that there were several chunks of insulation coming loose, and the worse discovery, the foam was only to " thick in a few places. Most of the heavy application was around the water tank. So, I definitely will be adding insulation. I'm also thinking that I need to show Reace the very thin areas when we're at the Escape rally in May. He can maybe update the "Quality Control checklist" based on the observations.
Thanks for the report.
Don & Teresa
2015 17A: 2011 Honda Pilot
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Old 02-26-2017, 12:28 PM   #25
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Join Date: Jun 2015
Location: central, Florida
Trailer: 2003 Lance 845
Posts: 17
Sorry for the long delay. They are air tabs attached to the camper ok ill go 80% but not any lower. I see them on tractor trailers and a few high end rvs. some say they keep the rear of the rv cleaner by interupting the swirl of air at the rear therefor keeping the road grime away?

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