For the battery setup I simply got rid of the single battery box and replaced it with a Camco double box. The welded in channels and location required no modification. I wired the two new batteries in parallel and added a dual battery disconnect switch on the outside of the box. Links below:
I did have to go to autozone and purchase some small miscellaneous items like 4 gauge red/black wires and battery terminals.
For the tanks, I removed the bolted on single tray and bought a double tray, added a double cover (my hybrid did not include a cover for the tank), and a new dual regulator. I also had to buy a second tank from Ace Hardware.
The hose hooked to the single regulator wasn't long enough to reach the base of the new regulator so I added the small extension above. Zip tied everything up nicely to the frame and boom... I had two 20lb tanks instead of 1.I was able to shift the location of the propane tray slightly so it was centered in between the tongue jack and battery box. I used black boated self tapping bolts to secure it to the frame, which is what was used on the previous tray.
Overall I would say the difficulty of these two upgrades was a 4-5/10. Just take your time, have some beer on hand and get'r done.
Ok, I have the trailer. I can get 2x 6v Deep Cells for same cost as 2x 12v and they offer far longer run time, and will fit in the dual box. The Propane upgrade is pretty simple. Both are first upgrades.
Now I am researching how to get the TV to run off batteries, and Solar to recharge the batteries. Maybe a small generator, too. Mo
st of our trips and 3-4 days, but we do a long 8-10 day trips every Summer in the High Sierras, and I almost always will be boondocking. Would love to have TV option with Genny running for sports or a comedy while sitting outside by the campfire and sipping Irish Whiskey.
Thank you so much for the info and details.