How about this or one like it in the 7 foot size?
Folding Ladders : CBS Performance Automotive
You can install as many have a pvc pipe storage unit to the frame of the trailer for the ladder.
This would allow you to move the ladder for other things like window cleaning or washing the front to remove bugs.
2016 F350 6.7L LB CC Reese 28K 2014 Chaparral Lite 266sab
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