First off, sorry for your issue with the slide/tires.
There is a section in the TrailerLife magazine that is dedicated to helping in cases like yours. The article says:
After exhausting all other resources without success, please forward information with copies of bills and correspondence to:
RV Action Line 3300 Fernbrook Lane N, Suite 200, Minneapolis MN 55447
Please include a self addressed stamped envelope.
No phone calls please.
Since I've been reading the mag, they have helped a lot of folks with all kinds of problems. Good luck.
PS-----Don't rule out getting your local Motor Vehicle Dept. involved either, after all it is safety related.