Go to Amazon, type in the exact name of your existing battery. This will bring up all batteries that match that model.. Look for a generic that says it fits or replaces the one you have.
Yesterday, I ordered a generic for my Dell Latitude that cost me $22.93 with free freight from Amazon. Been ordering batt's and parts this way for all kinds of my toys for a long time now and so far have not been burned.
Well, my passed history is this: 2001 Jeep Cherokee 2D, 2WDR, 5 Speed towed 4 down in neutral, steering unlocked with no conversions required. Then a 2005 Jeep Cherokee, 4D, 4X4, automatic, transfer case in neutral, tranny in park, steering unlocked.
Currently 99 Dodge Durango 4d, 4X4, Automatic, transfer case in neutral, tranny in park, steering unlocked.
I've transferred the same Roadmaster 9000/9600 Supplemental Brake system onto each vehicle over the years and it continues to work just fine. The first Class A I pulled the jeeps behind was a 1990 32' Winnebago Chieftain and the current Durango is towed by the 1991 American Eagle in my signature.
They're all relatively simple set ups.