I'm not a truck camper, but to answer the first question from my perspective..."Yes". We purchased the biggest, baddest, most expensive truck we could afford for the sole purpose of towing a trailer. Now that we have a 5er, I'm glad we made that decision. I have no other need for a pick-up truck than to tow the trailer. Expensive, well ... you simply can't put a price on "priceless!"
FYI, I've had a utility trailer and hitches on everything I've owned for the sole purpose of pulling the utility trailer to carry anything that would fit in the bed of a pick-up truck, and maybe more, not having to worry about scratches and dents and dirt.
We debated a LONG time about a 1 ton truck and trailer/5er opposed to a motor home, and the truck and trailer combination made most sense, although financially, they came out, about the same. No need for my truck, except as a tow vehicle, strictly for RVing. And it does get used as a secondary daily driver now.