Hi,
many thanks for answering. Indeed some feasible options.
I have one problem, one additional option and one question:
problem: you can't screw the underbody cover to the chassis without risking warranty
may be I may use hook and loop fastener.
option: The flex fix system with the drawer at the back is ideal to add a boattail
question: The sercice shop said the 15" tires have more drag than the 14" because they are wider. I would try to get smaller 15" ones if possible- are they underinformed- we may mount 185/60 R14 or 185/55/R15 without problems
cheers
gerfried