That 1050 munber is what the hitch platform is rated for, not what your truck is rated to handle. What you need to do is, fill the fuel tank, load everything you will normally take with you, wife, kids, bikes, ice chest full of drinks, etc and go to the scales. Once you have an accurate weight of the truck ready to travel, some online research you should be able to find your trucks GCWR (Gross Combined Weight Rating). Subtract your scaled weight from the GCWR number. Now, you have the maximum weight your truck will be able to handle without exceeding the max manufacturers numbers. Be careful, lots of RV manufacturers only list dry or shipping weights. I believe they do this to sell more RVs to unsuspecting buyers. I think it is wisest to make your calculations on worst case, choosing to be safe rather than sorry.