What I learned in the battery tray removal.....
Taking the battery slide tray out is easy, putting it back takes patience. Don't bother to call Kwikee Products, they never answered the phone. Along the rails there are two holes, off-set, the holes enable you to get an allen wrench on the bolts that holds the rollers that are off-set. The bolts have plastic caps so the caps come off first. You only have to remove the four rear rollers.
I found that my batteries had gased off and the tray was pitted with acid. I sandblasted and rubberized via spray coat. The tray is like new. To be pro-active in not having this problem (as well as low House power) I installed 4 six volt batteries, a watering system and most importantly I used Therm Oil to prevent the off gases and cable/tray/cables corrison.
Checkout this product and make the battery tray removal a one time deal
Very helpful company, look in FAQ's at www.thermoil.com .
Good luck with the project..