X2 on the mobile RV repair service. We've dealt with a couple of them and they were very good. They have to be since its their only business. You may need to call the Prime Time warranty department and get a pre-approval and/or pay the mobile tech yourself and submit it to FR for reimbursement. But given your circumstances, I would think the warranty dept at Prime Time would try to work with you to get it fixed.
2005 F-150 FX4
2013 Rockwood Roo 23 IKSS