Cutting the steps and pilot off the RDC trucks must be done carefully. I used a dremel cut-off disc at slow speed because the design of the truck is not sturdy and the plastic is brittle with age. I don't want to manhandle it with a handsaw.
All my trucks have been modified but if you (or somebody) post a photo of the bottom and top (Looking right down on each) of your unaltered trucks I can show you the cut marks you need to do.
KATO still sells RDC-2,-3, and -4 body shells and trucks, if anybody is interested. The shells come pretty much complete w/ windows and blister, with the light tubes and supports. And Even the frames and mechanisms (w/o trucks) are still for sale.