Fleetwood Prowler Electrical Problem

[srwlasvegas]

I have a 2001 Fleetwood Prowler 5th wheel. Unfortunately, haven't used for several years and have spent the last few days going through everything cleaning and testing so we can again enjoy travelling. Everything was fine, worked great. I guess using the word "was" is past tense. I am having an electrical issue that has me stymied. I have 110v to the trailer, all the electrical plugs work, GFCI not tripped. I have no power to the major appliances, A/C, fridge or WFCO. I checked the breakers and power to each, checked the neutral bar for loose connections as well. Any thoughts or recommendations. Any help greatly appreciated.

Thanks