I'm thinking maybe you are in shopping overload. You have looked at many options, and my bet is they are starting to run together. My approach to this RV thing is very different than most. I suggest you give serious thought to how much money you are willing to spend on the total package.
Used Truck camper prices are all over the place, I think $6,000 to $15,000 would be a good spread to consider. A 4 year old TC can have as many issues as a 15 year old TC. Typically their issues are the same. A TC is rarely an investment, they go down in value every year.
You can get a real nice used truck for $10,000 to $20,000. From what I have seen, Texas has some good buys one trucks. I suggest a 4x4 DRW Diesel, preferably a 8' bed Dodge. There are very few TCs it cannot handle. I would avoid the 2007 and newer trucks due to the EPA required stuff they have.
Personally I am not, and never have been, a big fan of buying new vehicles. I purchased my 2004 Dodge DRW 4x4 Quad Cab last year for $19,000. I have spent another $3,000 on tires, brakes and minor modifications. I am very pleased with my truck.
I purchased my 11.5 foot 4,000 pound Bigfoot TC in 2004. It was 16 years old. I paid $1,000. Over the following three years I spent over $8000 on upgrades. I hauled my 4,000 lb TC on my 2500 SRW 1996 Dodge.
I also pulled my 3,000 lb Samurai behind each of the trucks.
2004 truck and 1988 Camper
2004.5 Ram SLT LB 3500 DRW Quad Cab 4x4
1988 Bigfoot (C11.5) TC (1900# w/standard equip. per decal), 130 watts solar, 100 AH AGM, Polar Cub A/C, EU2000i Honda
Toad: 91 Zuke