Need truck guidance - Short bed pickup for slide-in?

I'd buy an F-350 Shortbed with the supercab to get you more payload. You can get some nice shortbed campers with a truck like that. You can get slideout campers like the Arctic Fox 811 and the Lance 855s or ones without a slideout like the Northern Lite 811Q and 85Q, Wolf Creek 840 and 850, and Northstar Arrow 8.5.