How to work at the top side walls of FW?

I just have a 7' step ladder. If I cant reach it I get on the roof.

I use one of those collapsing ladders that is about 2.5' high when down and 15' when extended. I can set it to the height I want and get as close as I want.

Wittmeba, that's how I replaced my awning fabric. Buddy has a side dock like that, just asked that I did it when they were closed. DW and I soaped that baby up and slid it in in 10 minutes. I had already slit the end cap at home as another member mentioned some years ago. No springs to worry about that way. Thats_OK is right, folding ladders are the bomb when on the road. I even lean mine against the RV ladder so that my weight is only on it for one or two steps when I have to get up on the roof. I'm not sure I trust the RV ladder completely.

Find a business closed on weekends that has a truck loading dock - not just a well but long dock. Pull your rig as close as you can and stand on the dock. It works well. Maybe even a 3-4' retaining wall.

I'm telling ya these folding ladders are the stuff baby!

I adjust mine with the last section flipped so it sits on the roof (whipped up some foam feet that slips on the ends to avoid abrasion damage).

Flip the end sections down to configure for a scaffold.
I can drag mine around between parking spots at the storage lot to wax the upper sections of our 12 foot 6 inch fiver.

Some of the best money I've ever spent.

For waxing & such it is A frames & boards in a boatyard for me. Yes, I am lucky to have access to a boatyard where I can do stuff & make noise to my hearts content.

If I had to do the work at a real home I'd get a couple of 10' ladders to use as A frames & run a board between them. Same result.

Thanks all, I appreciate your knowledge. I should mention that I have to park our FW at a storage facility so pulling the truck along side is problematic, but I like the idea. I have a 10 foot ladder and just cannot get high enough to look at the top of the slide outs. For me working from the roof is an invitation for disaster. I actually climbed mountains, but a roof on an FW, no way.

I work from the roof. I actually will climb carefully onto then slide roof of needed. I just make sure I move very carefully as not to hear all of my weight in one area. The roof is not designed to bear much weight. Putting down a 2' x 4' piece of plywood on slide roof would do the trick to work on as well.

We have a 20 foot folding ladder that I can setup as a ten foot long scaffold.
I just lay two 5 foot long 2x12 boards across the rungs so I can move back and forth without repositioning ladders.
This setup puts me at about 5 feet above ground then I can reach up to 7 foot.

Sometimes I park my truck next to the fifth wheel and lay boards across the bed front to back to give me a walking scaffold for higher work.

Hope this helps.

Roof......

Standing on bedrails of truck......

Collapsing/folding ladder (Little Giant)....

Really depends on what I am having to do and access next to slide-out
Sweeping roof off, washing/cleaning, treating seals etc.