Very satisfied with my Kwikee 2 step into my RV. When I bought the RV it was already 10 years old and all I did to the step system was to tape up the connector, lube the moving parts, and zip tie the electrical wire bundle to prevent road hazards from catching the wires.
That PV helped I think so now I have a 20 year old step with very little trouble...until a couple weeks and a couple hundred miles ago. While stepping up on the step, I hear a 'snap'. Couldn't localize it so didn't think much about it until a few days later when I tried to step up into the RV and the steps were swinging instead of nice and solid. It was dark so I left it for the morning.
Next day, crawled under there and, well I'll be, all four bolts that hold the motorized gear assembly were broken off. So the entire motor gear assembly was just hanging by the arm. Pulled the power connector and used four zip ties to hold the steps up. Since there were to be several travel days, waited 'till I could get to a place where I could work on it.
After removing the plate, and the motor/gear box assembly, I found another broken bolt in the gear box itself. So five bolts had broken. Several looked like stress breaks. Fearing the worst, pulled it all apart and was surprised that nothing inside was damaged. Gears were OK, motor measured OK, case wasn't cracked. In short, nothing wrong with the motor-gear box.
Took 3 hours drilling and using easy-outs to get all the broken bolts out. Lubed the inside, all the step pivot joints, put it all back together, mounted it all back up to the step and it works perfectly once again. Couldn't find anything that might have contributed to the bolts breaking...maybe just old age.
My point with all this is: For preventative maintenance, climb under there once in a while and check the bolts. For tightness and breakage. Once one goes, the rest aren't far behind.
I got lucky in that the step finally broke and swung free while I was parked. I imagine it could have been much worse if it had swung free while driving.
Oh, and for safety, I should mention that whenever you're under there, just pull the motor connector out so it can't operate.
Just checked and a new set of Kwikee 2-step assemblies are over $400! The gear box plus linkage is only $80 or so though.