Ok, so thanks to all the list for the feedback on the RM 182 amps -
sounds like no matter what, the best I could hope for is a few hours
of fridge time.  Just so far have not gotten my fridge lit on propane
yet, so will probably have to pull it and clean out the combustion
chamber and try again.

So, with that out of the question, I am not sure a deep cycle battery
is worth it for the other 12v stuff.  So has anyone used any of the
trickle type chargers to keep a main battery up against a light
weight inverter.  I have seen them in the 2 watt trickle charge
range.  That seems awfully light weight, so has anyone used them to
try and keep up a main battery against moderate use (maybe a fan, a
couple hours of laptop draw for a movie, some lights).

Thanks again,
David.