I went to look up the actual specs on that truck and the owners manual says there should be a separate piece of paper in the glovebox with more information about using a slide-in camper.
Here is other things I found. (dated 2018)
https://www.truckcamperadventure.com/top-8-long-bed-truck-campers-for-one-ton-srw-trucks/https://www.fordtechservice.dealerconnection.com/vdirs/quickref/default.asp?pageid=camper_loading&nomenu=yesThis second link shows you what each accessory weighs and than has charts to your carrying capacities.
just a quick view looks like this truck starts at 3752 lbs and goes down from there.
