Hi SEWRIGHT - Welcome to the forum.
Wow, first van and your first trip was a 2 month journey to Mexico, that's fantastic.
Re: an exterior electrical outlet - if it is for occasional use then this $2.77 adapter might be what you need. It will change the 30 amp outlet on the campsite power pole to a 15 amp standard household outlet.
30 Amp Male to 15 Amp Female Round Adapter