The first thing is to look inside the driver's door for a yellow sticker. The sticker will tell how many pounds your truck can tow. For 5th wheels the formula for weight that the truck carries is the Gross Vehicle Weight Rating(GVWR) of the RV time 20%. So if the 10000 lbs is the GVWR, not empty weight (UVW), then you would plan for 2000 lbs on the truck. I would think your truck should have over 3000 lbs of capacity. You have to allow for the weight of the 5th wheel hitch, passenger, and any other things that you carry in the truck. Normally an F-350 gas truck can handle much more than a 10000 lb RV as far as weight goes. Now if you will be happy with how well the truck will pull the trailer (power wise) is another conversation.