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How wide, what material and design are you planning to use?  They will have as much or more to do with suitability as length. High traction so tire holds when part way up or backing off and wide enough to put your feet down would improve. Remember backing down you will not use rear brake and front wheel without any weight on it will slide on most surfaces. A folding and locking full width mesh/industrial catwalk louvered steel rated for 500kg load would be best.  This would require a decent frame. Removable or fixed to tray bed, the options to consider mount up!