Using grid connect solar modules for RVs is readily done but needs an MPPT regulator. This article by Collyn Rivers explains how and why it is done.
Solar That Really Works!
Solar that Really Works! covers the design, installation and use of solar in cabins, camper trailers, caravans, fifth wheelers, campervans and motor homes.
Any bookshop, whether online or bricks and mortar, can order copies of Solar That Really Works! Just ask.
Caravan & Motorhome Electrics
The essential handbook for anyone with an RV of any kind. Everything you need to know to make the electrics in your rig work for you.