there are two guys i remember doing that -
1) larry the owner of starlight solar in yuma, az. his id on this board is batterypro.
2) marvin, mentioned by tina on her blog at wheelingit.us.
disclaimer: i have no personal contact with either.
some people on this board have done solar systems on their own coach. among them, some are/were electricians or electronic engineers. they might be willing to do side works or helping you with a nominal fee. one of them is tom (id: baphenatem). by reading his comments i came to believe he is very good.
overall, solar system install isn't a rocket science but does require a thorough understanding of electricity, battery, inverter, controller, wiring and rv in general. if you are confident you can do it, great. if not, find someone to do it for you, that money will be well spent.
Steven & Polly
2000 Country Coach Intrigue 40'
2014 Ford C-Max Energi