The pick the camper first then the truck to match is solid reasoning, but not always practical and IMO limits your range and buying power when you can’t show up with a fist full of benjis and a truck to haul it away.
BUT if you know the size of tc you’re wanting then get the size truck to haul it. FWIW, it’s not magic. Do some reading, talking newer trucks, last 15 years, 3/4 tons and 1 tons are the same save for Springs and number of back tires. (Mostly. I’d not want a coil spring 2500 Ram particularly but everything else is fair game. ). That is unless you get caught up in the yellow sticker game.
Full time hauler, I’d just get a dually and be done with it. Diesel vs gas is hotly debated. Diesel if you have the means, IMO.
