Just to throw total chaos into the mix, I currently use a Jeep Grand Cherokee with a gigantic cargo bag on top (Sherpak 20). With this setup I don't tow anything (my TT sits in my back yard) and still have a reasonably low center of gravity (try saying that about a TC). So any road I can navigate with the Jeep I can navigate with enough gear to camp in luxury for two weeks without repleneshing food gas or water.
I pack an REI Kingdom 6 tent which has enough room for me walk around in at 6'2", and has two rooms, one that fits my queen-sized inflatable mattress that sits 18' off the ground, and the other which functions as my office, complete with wide folding desk and comfy director's chair.
Since I often camp in cold weather, I have 4 sleeping bags, zipped together as double bags that nest inside each other, and then I have two more quallofil Wally comforters that I throw on top.
I carry enough solar (Renogy 100w bendable panels) to power my computer, my sat set top box and my Tailgater dish and to recharge my batts. I have inverter/powersupply/charger capability for up to 160ah currently, using a Goal zero yeti 400 box and exta AGM batts.
I have a tiny 500w inverter gennie that when combined with the panels uses less than a half gallon of gas a day. I carry a 6 gallon can of gas on the roof and I have room for more.
Since I have a background in cold-weather travel, I have all the puffy clothing I need to sit comfortably all day in a sub-freezing tent, only I don't need to, since I have modified the tent so that it is a surprisingly adequate insulator, considering it's a tent. If I ever remember to bring a thermometer I would expect to see readings in the forties during the day. Similar to my metal-sided TT with the heat off. In the summer I have a huge 20" box fan to keep it cool.
I use enough of the Nalgene 3L soft-side canteens for for a gallon per day of water, combined with a somewhat scarily-large supply of Diet Coke which I will not put a number on. I don't take showers, but twice a day do a thorough sponge bath using diluted hand sanitizer and wash cloths.
I haven't mentioned mountaineering skis, two pairs of ski boots, snow shows, climbing gear and a lot of wishful thinking; because with so much luxury in my tent I spend all day drinking Diet Coke and watching television, and laughing at people who can't break away from the television to go out and live life!
All of this stuff fits on top of my car or in back, with room to spare. If someone had a truck with a low shell on the back, carrying all this stuff would be even easier.
My point is that the only thing I give up by not towing my TT is the hot water heater. While I don't have a microwave that can run on 500w, I do have a 12v slow cooker that makes great soup or stew and can heat up a frozen pizza, although not well. What I gain is access to anything legal for auto travel, with enough gear packed that I can camp in luxury and hike or ski from there.