Clueless- how do I get my travel trailer running again?

Sounds like you suffered a power surge that hit your electrical systems taking out your Powermax. If this is true, then you really should have an electrician test your entire systems before you replace the convertor. You may have other damage that should be repaired before you go back on line.

If you can not take the rig to an RV shop you may be able to have mobile RV Tech come out to your storage spot.

Bob