I am running three standard issue GP24 Interstates in my 255AH battery bank. Been doing this since 2008 and camping alot off the power grid. These batteries are just now starting to see some fall off of performance with them. I really want to replace these with two 12VDC Trojan T1275 150Ah batteries on the trailer tongue and two additional 12VDC Trojan T1275 150AH batteries in the bed of my truck.
I have heavy battery requirements for my two way radios in the truck as well as camping in the off-road trailer setup. SO having the two separate 12VDC sources will fit my requirements of 300Ahs in each setup just fine. The beauty of this arrangement is when I am camping I can parallel the two 300AH battery groups together to give m around 600AHs when in camping mode...
These cost alot however so when the time comes I will most likely end-up with the cheaper two each GC2 golf Cart 6VDC batteries in series in each location. This arrangment will give me around 225AH in each location and only cost around $90 per battery verses around $150 per battery with the Trojan T1275s... I would probably be lucky to find the Trojans for $150 each.
Cost per AHs needed is hard to beat the COSTCO/SAMs CLUB 6VDC Golf Cart GC2 deep cycle batteries.
If you are a KEYSTONE CHALLENGER 5th Wheel four of those GC2 6V batteries fit very nice across the front door of the storage bay where your two GP24 batteries are now currently... here is photo how one guy did it...
Roy Ken
