This is JMO but, at 300 lbs. I would never attempt to use a ladder on an RV. EVEN if says it's rated for 300lbs. it really meant 150-200. I used mine once, I believe rated at 250 - maybe 300 (it's in the shop) and it worked fine....except, all the screws were loose after going up down twice. Never used it again, but....
I've taken it to the dealership several times to have the roof cleaned and serviced. I've watched them use the ladder. I've seen the bent bars. I've fixed, repeatedly, the loose, pulling out screws.
Use it as a convenience - it won't last long at 300 lbs. I now use a ladder from the side, or if I need the rear ladder access, I use a step ladder to get to the top 2 rungs and go from there - I weigh 206.
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Danny and Susan, wife of 56 years
2019 Ram 3500 Laramie CC SWB SB 6.4 4x4 4.10
2020 Montana High Country 331RL
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