I agree, it isn't the weight, it's the wind resistance.

Last summer I towed a 5000# travel trailer from the right coast to the left and back again. It struggled headed west across the (mostly) flat Montana plains to hold 55 -- into a 30+ mph headwind. Headed east (wind if any from the rear) and I went over the southern rockies easily at 65 mph and mostly w/ OD on. That big 8 foot square wall behind me was the killer. I got 10 mpg in Montana, and 14-15 mpg headed east in Arizona.

205/75R14 is all that can fit in the wheel well. ST are as good or better than P(assenger) and I couldn't find LT (Light Truck) that small.

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2005 CRD Limited Flame Red w/ Renegade rock rails & light bar, AirLift 1000. 225/75R16 MT/R's on cheap black steel wheels, dual MOPAR subwoofers, Ipod kit & seat covers, Samco hoses - totaled and gone. 2008 WK Laredo 3.0L diesel - AirLift 1000, wife won't let me mess with it much. 2013 JK Sahara on order.

Wow, only 14" wheels? Do what you gotta I guess when stuck with wheels that small. I know on my trailer with the 15" wheels, it is getting harder and harder to find SUV weight tires. I'd have to look to see if they are LT rated (I don't think they are) but at a used tire shop... You get to rummage.

Yea, I'm running used shoes on the trailer, but they are within age limits that I set for myself and I know how to check for dryrot. I wouldn't do like some of the folks I saw and use them for daily driver use... But do what ya gotta. Am I wanting to pay $400 for 4 tires that will probably age-out before I get anywhere close to their mileage? Not really, not on a trailer.

I'll get 4 16" steel rims for it, and 4 more used SUV tires for less than what it would cost for just 2 new trailer tires. Can't argue with the economics, at least for a cargo trailer.

I wouldn't suggest this for everyone, unless they have the ability to properly evaluate the tires before getting them. I run used on my RV too... But they aren't "used up" like the trailer tires. I get them specifically from fire trucks, who change out a 100k mile tire after only like 25k (still has 80% of it's tread) due to their policies. $300 tire... $60 mounted. Your tax dollars... Holding my RV off the ground. Thanks!

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