Need some suggestions on upgrading batteries for dry camping

[jamesroadking]

I'm thinking of modifying my Forest River Work and Play 30WRS toy hauling trailer to use for dry camping in the National Forest.
The trailer has big fresh, gray and black tank capacities, 2 @ 30 lb LP gas bottles and a single battery on the tongue.
I was thinking of purchasing four batteries and cabling them up for a lot more battery capacity. There's a generator rack on the tongue, but I was thinking that putting four batteries along with the two 30 lb. LP gas bottles is a lot of weight on the tongue.
Here's the questions, most these new batteries are sealed, so is their a fire / fume hazard if mounting them in the garage next to the wheel well box box on the same side and close to the trailer's stock inverter.
Anyone with thoughts on just keeping the extra batteries in the bed of my F250 while camping, (unloading when not camping) and running a jumper cable to the existing battery on the tongue.
Can the stock inverter charge 4 deep cycle batteries adequately?
If not what size battery charger do I need? I have a 30 amp generator that keep in the bed of the truck when RV'ing that I plan on using for charging the batteries every few days as needed.
Suggestions on battery size, type, and cabling the batteries up in series and parallel etc.
Thanks for your ideas and suggestion,

[dave17352]

I would put agm's in the garage. AGM's are nice, no maintenance. No venting. Now if you want super top of the line go lithium.

You can get by with less batteries if you buy some solar. Solar is awesome and cheap now. I have a 200 watt system with controller and wiring which only cost me 329.00. The great thing about solar is your batteries generally stay at a higher state of charge which adds to the batteries lifespan.

JMHO

[enblethen]

Deep cycle lead acid batteries are not sealed. They are not maintenance free.
I would suggest using 6 volt golf cart batteries wired in series. They are about $80 at Costco. You could use four wired in series-parrallel configuration.
I would suggest recharging via genset every couple days. Don't let them get down too far.
Verify that your converter is a multi-stage one.

[Joe417]

You have several choices. AGM batteries don't have to be vented. You can buy a sealed battery box and vent to the outside for Lead acid batteries. A lot of TC have the battery box inside and many boats have the battery vented this way.

I have 2 group 29 Lead acid batteries that will only last about 2 days running the fridge and a few lights. I added 165 watts of solar and this seams to keep them up without running the generator. I've only tested them on one trip so far and it was mixed camping.