I had exactly the same experience with Coachnet except i didnt know the flat was caused by a hole in the inside dually valve stem. Coachnet sent a truck who replaced the valve stem with a spare he had in his truck. No charge of any kind.
I want to hook up my 2001 damon ultrasport to the house just to keep the batteries charged. The outlet is only 5' from the coach and can't see pulling out the 25' cord and then plugging in the 50 amp to 30 amp adapter then the 30 amp to 15/20 amp adapter to do this. Can a 50 amp to 110 v, 6' cord be made? What would the wiring be?
I use a 100' 12 gauge chord plugged into 15amp outlet and connected to the coach with a 15 to 50 adaptor available from Walmart. Batteries and refer. Good luck.