no power inside 94 mallard

You more than likely have a disconnect or load center near the powerpole that provides 120V electricity for an RV,i.e. something of a steel box where you plug your shore power cord into. Test the outlets on that to see if you have power there. If so, plug in the RV cord and you should have both 120V inside and 12v to charge a battery or the lights. If not, you may have a hidden GFCI receptacle that has tripped. IT can be close to a sink in bathroom or kitchen or even outside on the RV's exterior. Most of the time, a travel trailer has one or maybe two 120V circuits that provide all the power to the outlets. If a GFCI is tripped, you won't have any power at the receptacles. If the GFCI is not able to be reset or tested, there is no power to it. Go back a step and check for power upstream of the GFCI, at the breaker in the trailer or at the place where you connect the shore cord.
Your issue is probably something easy, look for the most common place first.