First things first... you need to identify your batteries. If they came from a dealer, I really doubt that you have (2) 6 volt batteries. Count the caps on the batteries (6 volt batteries have 3 caps, 12Volt batteries have 6 caps). Then you need to figure out your batteries Amp hour rating. If you look up your battery (make and model) it will tell you that information. IE.. I have 2 Trojan T145 (6 VDC/260Ah rating) batteries. From there you can determine if what you have is enough for what you want to accomplish. TRUE deep cycle, and not marine/RV type, which has CCA rating are the best for dry camping. Marine/RV types are good for general camping with shore power or a 1 night dry camping outing. I would not look at any SOLAR system with less than 200-250 watts if you are looking at any dry-camping.
You also mentioned that you want the SOLAR to trickle charge your batteries while the TT is not in use, but you also mention you want to keep the panels portable. You are not going to be able to leave your panels unattended next to your TT to keep your batteries trickle charged, they will have to be mounted, or someone else will be enjoying your toys.
If you ask 20 people about what you need for solar, you will get a minimum of 20 different answers.
Panel wise there are different voltages: Low, Medium, High
Which is better? Depends on who you ask! My preference is High voltage (about 31VDC) Go to HomeDepot and look up Grape Solar 250/260 Watt panel (31VDC). I get 19.5 Amps through most of the day. My batteries are charged by 2-3PM each day.
As for SOLAR charge controllers you have 2 choices PWM or MPPT. PWM is used for lower voltage and is not as efficient as an MPPT controller. An MPPT Solar charge controller pretty much extracts all the power from the panel and through electronics transfers it to the batteries. If you are looking to eventually enhance your system with more panels, MPPT is the way to go (IE.. Morningstar MPPT 60 amp solar charge controller). Design your system to meet your current needs with room for expansion. I planned mine for a max of 60Amps. It is expensive to keep buying replacement parts because you did not plan on enhancing your system.
Low wattage panels are good for battery trickle charging (maintaining 13.2 VDC), but not for to much more.
You will also need a battery monitoring tool. A basic digital VOLTAGE display panel will get you through, with a lot of monitoring. My Moriningstar MPPT 60 came with a remote panel that gives me everything I need to know about the solar/battery status. There are other monitoring systems, but that decision would be up to you. I like the unit I have as I can see my systems live status/history on my Smart phone/Tablet/Laptop.
Done correctly, holes in the roof are not an issue. See my other post regarding installing SOLAR on my TT roof. Step by step instructions.
I am sure others will post more good SOLAR information for you to look over.
So now that I have really confused you.... GOOD LUCK
You can click on my SOLAR album below to see more of my system
Any questions just yell...
Just my thoughts,
Sorry for the length of this post....
2013 Jayco Eagle 284BHS
250Watt Grape Solar Panel, MorningStar MPPT 60 Charge Controller
1500 Watt Ramsond PSI, 2 Trojan T145 Batteries (260Ah)
2 - AirSight Wireless IP Cameras (used as rear view cameras)
EnGenius WI-FI extender, D-Link wireless (n) modem
MagicJack Internet Phone
2012 Ford F150XLT, EcoBoost w/3.73
157" Wheel base, HD Towing Package
Our Solar Album http://www.jaycoowners.com/album.php?albumid=329