Using wooden framing under the camper for height and clearance can add up to a lot of weight without the R-value in the floor you get from foam. Lots of folks use the wrong foam is my point. Using closed cell foam without a high XPS rating is doomed to fail. From side to side rocking the edges get mashed down allowing a lot of rock over a slightly curved landscape. Another option with the same 100 psi load bearing is Styrofoam brand High Load 100.
One of the advantages of using a Dodge RAM or Chevy pickup as your packmule is you don’t need to raise the camper to clear the cab. My old Lance 165-s sits on a 3/8’s inch thin sticky bed mat making the mating surfaces the tightest and lowest they can be. As you will see in my Trip Report to Canyonlands (on the editor’s desktop), inches make a big difference.
BTW, we will become official members of Club Northstar Laredo SC picking up our 2020 version at the factory in mid September. It has all the changes and upgrades that the editor complained about, changed, and upgraded on his own Northstar Laredo SC.
2020 Ford F-350 XLT FX4 4WD SRW SB SC 7.3L Godzilla Gas TorqShift 10R140 397 amps dual Alt dual batts Frnt Dana 60; Rr Dana M275 E-locker 4.30's 4580/4320/4066# payload 7243# curb wt. 11,300# GVWR 5-er prepped. 2020 Northstar Laredo SC, 12v compressor fridge, cassette, 320w Solar sub zero insulation.