Need new RV batteries, need advise.

[rvpopeye]

If you can fit the golf cart batts  , they are 6 volts instead of 12 so need to be hooked up in series instead of parallel .(Best choice IMO , even if you have to redesign the compartment (if at all possible).)

If you can't disregard all the rest and just get the marine versions.
You should get pretty good service from them as long as you keep 'em charged full up , The GC batts probably have more capacity and should last longer in service , again if you keep 'em charged full up . (see the theme forming here ?)

To do that:
Attach the 2 main cables to the positive of one batt and the negative of the other one . (red to positive ) 
Then use one (if long enough) of the jumper cables that are between the batteries now to connect the unused batt terminals (Positive TO Negative). 

(Again I agree with Stern,s great advise ^)

Maybe you could use those panels in a portable type hookup until you can get them mounted (uptah that roof thayah Chummie )  leaned against the rig or laying on a picnic table etc.


OH Ayuh !

 
You CAN do this ! Just post up questions , we'll leave the light on for ya ! (it's OK , it's on solar !)