We put a pair of the Costco GC2 batteries in our last fifth wheel about 2.5 years ago, and moved them (and the inverter) to our current GD when we bought it last summer.

We've did a decent amount of boondocking the first year we had them, and they run our residential fridge every for 4 - 8 hours every week on travel days (we're full timers).

Overall, for the price I've super happy with them, and wouldn't hesitate to buy another pair or two.