I agree that few pilots want to invest in a special-purpose "glider towing only" vehicle. I've towed with everything from a Jeep CJ-7 (not a lot of fun although you never had to worry about nodding off to sleep accidentally) to a mini motorhome. I fly 3-4 contests a year and keep my trailer at home, towing it up to the gliderport about an hour away.
So years ago, I bought a used full-size Chevy van on eBay and fitted it out (also using eBay) with an interior, reclining seats, lights, sound, etc. There's a full-width third-row seat that I can sleep on (obviously not while driving). I paid about $11,000 for it 18 years ago and put another few thousand into equipping it. It's still got less than 100K miles because the only thing I use it for is soaring with occasional family vacation trips.
As Charlie Spratt told me once about all the guys with full-size vans: "We buy them as trucks and drive them like cars. So they last a long time."
I stays packed with all the tools, spares, equipment, etc., I use for soaring. I've slept in it for every contest since I went crewless about 15 years ago--with exceptions for Uvalde and TSA. If it's warm/humid, (e.g., Cordele, or on the road to a contest at a rest stop), a small fan cools things down just enough. It's long ago paid for its cost to acquire and I like the fact that I never really have to unpack/pack it.
It's comfortable to drive and a dream to tow with. Reliability has been generally good (the few problems have all been on long-distance soaring trips, of course). Mileage is OK (mid teens) but I don't drive it that much. It's got a V6, which has been enough to haul a family of four out West with the trailer multiple times. More recent V8s would be a better choice for both power and economy.
The one thing I miss is AWD/4WD. Once in a great while, it would have been nice to be able to drive out into a field instead of carrying the glider out in pieces. But that pushes up the cost and complication. Despite my participation on this newsgroup, I try to stay friendly with other pilots so that if I need 4WD someday, I can borrow it.
When I was growing up and for years after, we towed with the daily driver. Breaking that rule can be very expensive but it doesn't necessarily mean buying a brand-new high-end vehicle that sits most of the time.
Just another view.
Chip Bearden
JB