I need AC electrical advice from a contractor (Calimesa)

I am building a van, and I want to run 110 shore power, but I need help with designing a system that will allow me to choose between 30 and 50 amp shore power plug in.
I want to run both so I have the ability to power the van wherever I park.
If you have 12v solar knowledge or RV knowledge that would be helpful as well, if you can help me please contact me at show contact info , my name is Leo thank you.