Do you have stabilizers like this?
Mine were bolted to the frame by two bolts on either side, in the front, and same for the rear. I had problems with them creeping down while driving, no matter how tight I raised them. I finally removed them, welded tabs and drilled holes, and now pin them each time I retract them.
What I am getting at is it is probably much easier (they are heavy however) to unbolt them and remove them. Lay upside down on sawhorses and thoroughly clean and lubricate the screws.
After getting them clean, use a dry film spray lube or possibly something thin like WD40 or LPS2, that won't collect much dirt and grit.
Doing this will allow you to extend the stabilizers as far as they will go, exposing all of the screw threads. I suspect they need cleaning. One of my screws was bent and I removed it and carefully straightened it (they bend easily).
Before I got to the point of installing the pins, I was securing them with wire ties every time I put them up. I had one extend and was almost touching the ground when I got to a campground and discovered it, and on the return trip I had two of them start creeping down, my buddy was behind me and called me to pull over and we secured them.
For use with the drill order a socket like this, designed for the purpose.
https://www.amazon.com/Camco-Chem-57.../dp/B01F8E60LA
Charles