As a 5'2" vertically challenged woman, I had wondered the same when I scrubbed and polished my trailer 3 weeks ago.
My husband has a "little giant" ladder. I was able to adjust the ladder to the correct height, climb and straddle the ladder with 1 leg on each side leaning over and doing 1 half of the top at a time. Took 2 days to wash and polish (I used NuFinish...didn't work) and now 3 weeks later all my efforts were to no avail because the little bit of shine I did have is now gone. I KNEW I should have just polished it right the first time with Poli-glow!!
Maybe in the fall
when the weather cools and we get ready to put her away for the winter...then she'll be like new when she emerges in the fall