@OP:
Right out of the gate you state you are intending to order a high payload 1/2 T truck. While that might sound good, it is an example of putting the cart before the horse. You seem to have a decent criteria of the camper feature that you want and need, the best way to go about it is to find the right camper that meets those needs and then get the truck. Believe me, that #2600 payload will get eaten up pretty quick!
With all due respect to those who put campers on 1500 series trucks (and yes, it can be done), those types of truck are really glorified grocery getters. Consumers are demanding good riding vehicle that look like pick-up trucks. But when it really comes down to cargo carry capacity, the step up to a 2500/ 3500 series gains a lot of advantages in order to do the work you are asking. And as stated, no one ever regrets buying "too much" truck for carrying a camper.
A larger series truck over the 150 buys bigger brakes, larger drivetrain components (including floating axles), perhaps a larger cooling capacity and most likely a larger alternator for charging.
There a lot of numbers/ specifications tossed around on those glitzy advertisements for half-ton trucks, but do not limit your camper selections by going right to a 1500 series truck without doing your due diligence on ALL the numbers on both campers and trucks to correctly match the camper-you-want to the truck-you-need.
I purposely bought a 3500 for my first pop-up knowing that I would be stepping up in campers as time went on. I am at my limit for camper that it can reasonably carry. I did this knowing that I do not want to buy a new truck every time i got the itch to get a larger TC.
