Its not that they will not install the RCX. Its just that they will not even consider having an RCX kit brought in. I can possibly get the Skyjacker kit through one of the shops since they will bring in their 2". However im looking at $2500+ for that one.
I would deal with the slightly extra hassle of ordering the rcx kit myself then. Its the best kit on the market right now an I think you would be happier with it in the long run. Plus you can run it at 4" with no issues. An that will look perfect with 33's.