When I removed the bellypan at the rear of the trailer to repair a gaping hole, clean up the frame and POR the rear frame rails, I tore out the remaining pink insulation from the last cross member to rear compartment. I had to choose between the thick blue foam insulation board and Refectix. I chose 4 alternating layers of the stuff with the first layer glued and stapled to the underside of the floor.
I just cut out the outrigger behind my street side rear wheel and removed the pink insulation hanging down. I plan on sticking in 2 layers of 3 inch pink insulation in between a layer of Reflectix on the bottom and one on top. The idea is to try to keep water and dirt from the pink insulation and give additional insulation under the water heater and bed area without extra weight. I will probably add additional layers of Reflectix in the side/rear storage compartment along the wall because this is the corner bed area prone to drafts.
'01 2500hd ext. cab, 8.1 litre gas, 5 sp. Allison auto
3.73 rear end
Mag-Hytec rear diff cover
Amsoil Dual by-pass oil filtration system
Amsoil synthetics all around
265 watt AM Solar, Inc. system