Hi,
900 pounds of hitch weight is going to require a 3/4 ton truck or a specially picked out longbed F-150 with the max tow ability and max cargo rating. You can buy a longbed supercab F-150 with a 1,900 pound cargo rating.
The 2015 pickups now have a aluminum body, and still have the same 7,850 pound GVWR, (XLT and 4X4 options) but a 5,800 pound curb weight - due to the aluminum body.
The curb weight of a GM 2500 diesel will be a lot higher than the F-150 ecoboost, so even though the GM might have a higher GVWR, the cargo rating might be similar. And because you are moving a 7,800 pound truck all the time, you might expect mileage to be around the same as the 5,800 pound Ecoboost when you are doing your daily driving. And expect the GM to be about $8,000 more due to the diesel option.
The first thing to do now is get a towing guide from your local GM dealer, and see what it will tow. What will it carry? If you ever plan on changing to a 5th wheel, consider a 3500 series truck, the base cost is nominally more than the 2500, but it can carry an extra 800 - 1,000 pounds, so towing a fifth wheel is possible with that one.
http://www.fleet.ford.com/towing-guides/ Select the year, and then look up what it will carry. Cargo ratings are on page 10 (camper weight ratings) and towing is a few pages down.
Fred.
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