Okay, this has been an interesting thread. I have a GMC Yukon '98 with 196k on it. It has and has always had the worst brakes of any "truck" I have owned. Also own an 04 Audi A6 wagon - LOVE IT - even though CR says it is a POS. Currently have ITB VW and open steel trailer. As Greg pointed out I too have growing desires - would eventually like a 24-28 foot closed. I will soon replace the Yukon and I do not want another full sized truck or SUV. I do not like the idea of towing with anything short of a half ton truck/suv/van. The cost of a dedicated tow vehicle even if well bought used does not make sense. I know our hobby doesn't make sense either, but most of us must balance all the things we spend our $$$ on. So, lately I have been leaning toward renting and approppriate tow vehivle as needed for race weekends and even splurging on an RV rental for big weekends. The $$$ work out very well when compared to the total expense of a dedicated tow vehicle. Anybody aggree or disagree?????
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The rental RV thing can look very attractive, but there are a couple of gotchas:
1) Most rental companies charge per mile driven. Adds up fast. So the economics depend a lot on how far from the track you are. Also remember that even though you may only be at the track for two days, you'll have to pick up the RV on Friday and return it Monday, at best, and that's 3 nights in their book.
2) Most rental companies have clauses in the rental contracts prohibiting you from towing with their RVs.
3) Many RVs are not really equipped to tow a 28-foot enclosed trailer. You'd be amazed at how close to their max GVWR they are just with the weight of the coach and all of the crap inside they are. Some models may list high tow capacities, but those are assuming that they are dry (no water, kitchen stuff, clothing, or people) and without many options. There are some that surely can do it, but not sure you'll find them on the rental market.
So it can work -- just do your homework.
FWIW, I have an '04 Suburban 3/4-ton with the 8.1L gas engine. Bought it used, the used market has totally tanked on these things. Gets crappy mileage but I love it compared to the Duramax diesel trucks I used before (a crew-cab dually and an 3/4-ton extended cab). I didn't own either one of those trucks but towed with them regularly. I'll take the big SUV gasser any day. And I have no complaints with the Suburban around town and in parking lots. It gets used only for towing and for hauling stuff around.