Solar panels for RP177

It helps to know what your objectives are for your solar charger.  What items in the trailer do you want to be able to run from it (forgetting the a/c and microwave) and how many days do you plan to boondock at a time? Also, what battery(ies) do you have now? Do you usually camp in open areas or in shady spots? 

OTOH, I have just a 25 watt panel and Battery Tender controller to keep my battery hot in storage.

I use an Aims 300 watt inverter in my home system for the stuff that is 120V. 

https://invertersrus.com/product/aims-pwri30012s/

Remember that "go big" thing?  Had I known that, I could have just bought the inverter in the beginning and not had to make and buy 12V lights.  Now I have both.  The Aims will fit behind the breaker box in my 180 and could run my TV and laptop. 

OK, based on your usage profile I'd suggest you start with between 100 and 300 watts and keep it portable. The fridge should be left on propane as others have said. It does need 12V but uses a tiny amount while on propane. You will mostly be using lights, fans (cooling and furnace), and entertainment. Of those items the vent fan and furnace fan use the most, so tend toward the upper size range if you plan on cooling (fans only) or heating a lot, the lower end if not.  

The benefits of portable solar are ease of installation, no roof penetrations, and  when you are camped in the shade you have the possibility of placing your solar module(s) in a sunny spot. The downsides compared to roof mounting are setup time and theft risk. Your choice.

The batteries you have are as good as you can get short of investing in a custom lithium system. But, if you're boondocking somewhere for a week and run into a string of cloudy days you will run out of stored energy, even with a solar system. You might want to consider a small generator for that possibility. If you're moving every couple of days the batts can recharge from your TV alternator, and in a pinch you can use that to recharge them at the campsite as well. Here in the east cloudy weather is common enough that I carry a generator. 

You can buy a kit online which includes a mounting rack and charge controller as well as solar. That is the easiest but costs more.

Or you can make your own. The best bang for the buck would be to find a standard residential solar module, those are around 3.25 x 5.5 feet and produce around 250-300 watts. Weight is about 40 lbs. These can often be found on CL or Ebay leftover from solar projects for about 50 cents a watt. Try to buy locally to avoid shipping charges. You would need to make up some mounting legs for it and get an MPPT type charge controller (not a PWM controller). 

With either the kit or the homegrown version you can connect them directly to the battery, you don't need to use the solar port connector or buy the proprietary products meant for those. For safety, please do install a fuse at the battery + terminal and make connection from your charge controller to that. Don't relax safety standards just because it it 12V. You won't get shocked but a shorted unfused wire from a 12V battery can cause a fire just as easily as it could at 120V. 

Okay, what was stated on the web site is that they are going to pause taking new orders so they can catch up with the backlog on existing orders. When in doubt, go directly to the source.

The store will re-open July 31st.