Don totally ragged on my PSP units but he did it proper by explaining where they are of use. He's right -- they are pretty useless in snow/ice, but have helped immensely on dirt/sand. I used two stacked together as a bridging ladder over about a 2-3' gap and they hardly flex when stacked and driven over. I'd love a set of the actual Mantec Bridging Ladders with the reinforced sidewall, but they are pretty specialized and very expensive for the use case.
Cheapest bridging ladder is available from Home Depot and can be used to keep warm in the evening, after use.
Graeme Ware -- San Carlos, CA
1990 Range Rover Classic - LT230 Transfer box, Warn winch, 2" lift, 235/85-16 Dunlop MUD Rovers, "Blue Submarine"
1996 Discovery 1 (R380 Manual Transmission, Ashcroft under-drive, RoverWare rear bumper, 33x12.5-15 BFG ATs) -- we call her "Katrina" -- Fordyce 7.5 mile survivor
1999 Discovery 2 (D1 CDL Linkage, 265/75-16 BFG A/T KO, RoverWare front and rear bumper)
1993 Jaguar XJS convertible; 1971 Triumph GT6; 1959 Morris Minor convertible
other assorted British pot metal ...