I have a Rockwood with a rounded front cap. While not as rounded as yours, I cannot reach the very top with a ladder. I found the softest extendable car wash brush Incould and use that to wash the bugs and grime off the hard to reach areas. Numerous washings with no scratches or marks.
As far as waxing, I have a dedicated pair of white-sole, soft rubber shoes I wear on my roof. I only walk up there after I make sure there are no rocks or other debris in the shoe. I then can wax the upper part and inspect the seals while up there.
When I must kneel to wax or seal, I use an old saddle blanket folded in half to kneel on. They are soft enough to protect the roof, and dense enough to spread the load, and soft enough for my bad knees.
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