Should you get the higher gcvw

If you were buying a 2015 f350 would you get the 10000lb gcvw or the 11500 gcvw what exactly is the difference between the two.

Both numbers are very low for GCWR, they are more in line with GVWR. Are you sure you are asking about gross combined weight rating? Gross Vehicle Weight Rating is for the truck, Gross Combined Weight Rating is the max allowable for both the truck and whatever you are towing. If you are asking about gross vehicle weight rating you need to figure the weights of what are you hauling or towing that will be on the truck. This can be the weight of a cabover camper; hitch and pin weight of a fifth wheel; or the weight of a travel trailer tongue and hitch; plus all the stuff and people in the truck. The exact difference between the two is 1500 pounds. Take it from there. If in doubt go bigger.