More than 100 watts can get to be a problem for hauling around and storing so maybe get a 100 watt portable kit with a 20 amp controller now and if you want to add more solar you can put that on the roof. If you mount the controller in say the front storage compartment you can connect it to the battery (via a fuse) and run all your solar modules over to the controller. It doesn't hurt to add solar modules of various sizes and/or tilts together as long as you combine them in parallel electrically. 

As an example, my summer usage estimate is below. It's about 77 AH, of which about half is running the fantastic fan and a smaller 8 inch fan (its hot here in NC in the summer). Once you have your daily AH, multiply that by 3.5 to determine about how many watts of solar you'll need. In my case its about 270 watts because I'm running those fans 24/7. If I wasn't running those, 100 watts would be plenty. 

This is for camping on solar for a long period. Depending on your usage, if you only camp for a few days without hookups, your battery could carry you through with no solar or with a smaller solar system.

For us, because of our limited power needs and the fact that we tend to camp where there is a lot of sunlight available, a 100W panel meets our needs almost all the time.  But for others, it would be grossly inadequate.

The panels you mention would be adequate for the first and occasional use of the second but it would take a lot more battery power and panel capability to accomplish the 3rd. There is a video blog "Gone with the Wynns" that shows them running their motor home on solar. You would be spending tens of thousands of dollars for the equipment to do so unless you can get sponsorship of solar and battery makers like they did.

Poke around on this site some looking for solar. There have been many, many discussions about how much solar is required, depending on what you actually need.

That being said, in addition to watering monthly its good to hit the battery with an equalizing charge at about that same interval to avoid electrolyte stratification and plate sulfation. A day or so on the charger would do it. If you can't do that then you might be better off with a larger solar module and a multi stage charge controller. 

If your batteries are powering the internal loads (propane detector, radio standby, usb ports, etc) during storage you will need a larger solar panel (20-50 watts) and a charge controller. 

During storage, especially in the summer heat, the fluid level in the batteries needs to be checked at least once a month. Most flooded batteries will need topping-up with distilled water now and then when they are on a maintainer.

I have 2 6 volt batteries in series to create a 12 volt battery.  When I am home from camping I want to keep my charged batteries at capacity.  Is anybody using solar battery maintainers or trickle chargers?  My pod is kept away from an electrical outlet, and I don't want to lug the batteries from the pod, so a solar charger would be best.  

Any recommendations?  Brand?  output size?  I am assuming a can just keep a solar charger connected 24-7 until I am ready to take it out again.

Thanks in advance...

Steve