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The rigid foam board i used is by Dow. It’s called Dow Blue Board, 4″x4’x8′. It is not cheap. $187.05 out the door for two 4×8 foot blocks. It was very hard to find.
Do you need a block? i can supply as i have the one left i can sell for $75.
It depends on where you live. By the looks of the damp fir trees you must be in the NW.
You need a foam bumper at the front bulkhead of the bed. 3 inches would be ideal, but I used 4″ from a cutoff piece of the 4×8 glued on top of the foam in front.

The other brand is Foamular 250 by Owens Corning that can be had at Home Depot. But beware it’s only 2 inches thick and doesn’t have the R-value or rigidity of the 4 inch.

I used my form fitting thin rubber bed mat under the foam.
We leave for Death Valley next week so I’ll report when we return.
Are you going to the Feb. Rally?

Take a look at the cab clearance and back set above.

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.