We have a half-ton Ford F-150 that is 4WD and has the off road package. It's got the big block 6, and 31 inch tires. We would like to use it with a slide in camper that weighs 1700 pounds. The owners manual does not say exactly how much weight the truck can handle. Does anybody have an opinion as to whether or not the truck can handle it? Do we need extra springs added or air shocks in the back? Thanks for your input!