That is a really nice unit buit by Lance-A-Lot, I like the way it centers the camper as well as lifts it for clearance. I winter camp so I used two sheets of Owens Corning R-Tuff insulation, they are 1/2 inch thick and after 18 months have not compressed, on top of that is a 3/4 inch sheet of exterior grade plywood and then a heavy duty rubber mat. This gives me a little more than 2" in clearance over the cab.
2006 F350 DRW, King Ranch, 4x4 6.0 PSD
Bailey the rescued Golden Retriever (At the Rainbow Bridge 5-12-2009)
2007 Escalade 37 REB Fifth Wheel
2001 25 ft Sportcraft
Y2K Silverado 1/2 ton...Whipple Supercharger,SuperSprings Airlifts (I know...)
97 Bigfoot 15C9.5FS ,FastGuns, 2 x 75w Solar
77 Chevy 1 Ton C30 (I love this truck)
2000 Chinook concourse (uncomfortable , badly designed rv ,must get rid of it :-( )
I made some by nailing (2) - 8ft 2x4's together and laying them length wise in the truck. There's 2 sets of these, each one spaced about 6"-8" in from each wheel well. I also made (4) stands that will cradle the 2x4's when not on the truck. They fit in between the camper and the side of the truck when the camper is loaded in the truck. That way when I do extended hunting trips I can take the camper off and drive where I have to drive.
I like this because there's no need to bring extra horses or anything. And there's no added weight like a frame on the bottom of the camper thats always there. If anyone wanted some pics to better help describe what I have I could probably get you some.
2001 F-250 XLT, PSD, SC, 4X4 Off-road, camper package, auto, highland green, 3.73's, pwr seat, keyless entry, trailer tow pkg, sliding r. window, cab lights, pre-pump mod, Silverstars, fumoto valve, K&N generation II intake,DI custom 4-pos chip, auto-meter gauges, full pillar mount,ISSPRO TTM, 4" turbo back exhaust, wrap around bug shield, Lakeland topper, tinted windows, fog light mod, acetoned emblems, brite-box mod, PNI digital compass/thermometer/barometer, Alpine Head unit w/6 cd shuttle, SUVlights harnesses, stainless grill insert, auto-lock and seat-belt chime disabled, de-blued ford emblems, White Nights, Stinger HP w/piggyback, 55watt under truck courtesy lights, Mobil 1 synth fluids, RS5000 stabilizer, Wicked Wheel, Air-Lift bags, RS9000 shocks w/controller, Sirius sat radio.
Best MPG: 367 miles/16.0 gals.= 22.94 (unloaded, tailgate down DI chip #2 setting)
I did the same basic thing as Brad except I put a few cross members between the 2x4 perimeter frame, then cut the foam blocks to fit the gaps, then covered it with a 3/8" sheet of plywood. Screwed the whole thing to the bottom of the camper.