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First off, how does one reach the roof from the outside of the trailer? Do I need some sort of scaffolding?
>>Older RVs will have an emergency egress in the roof, open it and work from inside.
No roof hatch on a Uhaul, left side window was the emergency
escape.
OP's first mistake is buying a Uhaul, LOL, we had one, have since
sold it and replaced it with a
Casita. But to answer the questions, to access the roof we have one of those rolling steps like you see in Lowes and Home Depot. Two actually, one that is 6 feet tall, the other taller. To get under the trailer we have a nice set of solid wood ramps that were custom cut at a sawmill for use in a truck shop. They are wide and very stable.