Google 'sand ramps' or 'sand ladders'.
This site has various devices. http://www.discountramps.com/sand-tr...FZeXfgodh90Gmw
Some are better than others of course, and some are godawful expensive.
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2008 2619, 85W factory solar, 150W Samlex inverter, 40 gallon fresh water tank, dual NAPA 8144 225Ah 6v batteries, WFCO WF8955A 3-stage charger/converter
2007 4Runner 4WD V8 tow vehicle, Firestone airbags, 600W Samlex PSW inverter, Toytec Boss suspension
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