No specific tool kit, because there are only a handful of tools needed. Most of these you'll likely have in whatever tool kit you already carry in your pickup. All fasteners are, indeed, SAE rather than Metric. Tangent: This bugs me. Ha. Even though I'm in the U.S.A., everything I own and work on is metric (pickup, dirtbikes, ATVs, snowmobiles, snobike, bicycles, etc.) and metric is more intuitive so having to also have SAE isn't ideal. But Arnold explained SAE is the more accepted for the RV industry so that is what they went with, which makes good sense. Only thing I own that is still SAE is my enclosed trailer and that is likely SAE for the same reason. On to the tools...
Keep in mind that the following list applies to my 2020 CAMP-X. Some fasteners may be different on older or newer campers, but the following will give you a starting point.
Allen wrench or allen sockets:
1/8"
5/32"
3/16"
Sockets and/or Combination wrench:
3/8"
7/16"
1/2"
9/16" (these big ones are for the jack stands)
Phillips and Standard screw drivers
Open end adjustable wrench (crescent wrench)
Odd ones that may not be needed:
Square bit (solar and rooftop cable holders, access portal rings, parts on the door)
Torx bit (parts on the door)
This doesn't include any propane line or plumbing tools.