Mike,
Our usage is very similar to yours (just the two of us) we have two 12v WC batteries and we recently purchased this briefcase solar from Renogy Solar
http://www.ebay.com/itm/281556876312?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
The main reason for the portable was that we can point it directly at the sun verses having the panels laying flat on the roof of the RV which is not very effective.
This being our 1st. plunge into the Solar world we looked into Go Power, Zamp and Renogy and based on quality/cost we decided on Renogy, but there are trade offs. If we wish to upgrade at a later time we will have that capability.
One item to keep in mind is to be sure the panels are Monocrystalline, the panels we purchased were manufactured in Germany.
Good luck with whatever decisions you make.