You certainly could could get a new nicely equipped gas truck and a really nice used TC for 60K. If not planning on towing and just the camper the gas would be fine. I bought my used TC for 5500 and it is as big as they get without a slide. It was in excellent condition and is a four season. As Kayteg says you can do a lot to a Truck Camper for relatively cheap. With my solar and my 12 volt danfoss fridge which you should check into if full timing I probably have about 8500 in my TC and I would be very comfortable full timing by myself in it.
I do think you would like having the 5 year power train warranty when heading off into the wilderness. For 10k you can get some really nice TC's if you shop around. Unless of course you want multiple slides and in great shape.
JMHO