I purchased the WattCycle battery at wattcycle.com. Youtube has several teardowns from people I like and it seems like a good quality product which is key to avoid fires (Thermal Runaway). The price is currently $169.00 for 100 Ah. I went with the regular size without bluetooth. A single 300Ah weighs over 50 lbs. I went with 3 x 100 Ah batteries since they are about 20 lbs and I can actually move them around quite easily. I went with three because of the price and because you don't really want to mix and match cells later. I also purchased a 2000W Renogy Inverter (do the load calculations to determine size) with automatic transfer switch so when I am connected to shore power it switches from batteries to shore power for $300. In your set-up don't forget the bus bar, fuse/circuit breaker, heavy duty cables to handle the load. The 2000W Inverter is fused at 250 Amps so I am using 2/0 cable. Read your Inverter's instructions since they all have little things you want to include. The battery "well" in the trailer will fit 2 of my batteries, I am removing the battery vent cover since that is for unsealed lead acid batteries. With the mini-size batteries you will need to check dimensions.