On the subject of filling the tanks and trying to keep from scratching the paint in the fill area, my thoughts are you get better with time.
I try to always fill at a Love's or other truck stop with a slave pump on the passenger side.
I carry a pair of leather gloves under the driver's seat in a ziplock bag. I only use them for filling the diesel and DEF.
The procedure that has been working for us, it to start the pump fill on the driver's side. Then start on the passenger side. Keeping an eye on the driver's side, it will shut off first. Complete fill on passenger side filling right to the brim. Put that hose away and put cap back on, on the passenger side. Go back to the driver's side and top that side up.
As far as scratches or chips, I've found that it mostly happens from the chain and mostly when the chain gets twisted. If I take a minute to make sure chain is not twisted, it will lay on the step tread, without chipping or concern.
We have to black base on our 37FS and though there are a few chips, that don't really show or I've gotten use to them.
Ric and Jan Golding
2016 Jayco Seneca 37FS