Wal mart x2.
I have used the same 2 WalMart Marine Deep Cycle batteries for the RV and the boat for 4-5 years. I take them out of the RV to use in the boat to troll with the electric motor and start the big engine. When I take them out I put a battery I keep around for the tractor in the RV. It is about a 10 yr old 750 cold cranking amp wal mart car battery but still starts the tractor every year.
I have had two Wal Mart batteries in the Silverado for 6 years.
I tried 6V Golf Cart batteries from Sams Club for a few years but they are so heavy, big and if one goes south you should buy two new ones to replace it. They only lasted about 4 years before one quit holding a charge.
