I carry a fairly light (~2500 lbs) camper, no trailer and love my diesel. Most of my camping trips involve days on the road to get to the destination. I made the trip before with a gas engine and just a cap on the back to sleep under and it was far from stress free. Between the truck searching for a gear on modest slopes, to keeping an eye on engine temps trying to pull the the mountain passes out west then hoping I don't burn up the brakes keeping speed under control on the downhill side, not to mention the pathetic gas mileage, as long as I have a camper I'll have a diesel.
CAN it be done with a gas engine? Absolutely. Will the drive be as relaxing as with a diesel? Not even close.
I think you'll find most people that have tried diesel won't go back to gas as long as there's a load in the bed. There are some diesel owners contemplating going back to gas for their next engine, but I don't here too many reports of people actually doing so and being happy with the change. With very few exceptions those that claim a gas engine is just as good as a diesel don't have a lot of experience with diesels.
My $0.02