I've heard that Deka makes good batteries but at 55 ah rating they can keep it. I'd be looking for a higher rated battery in the ah category.
'01 2500hd ext. cab, 8.1 litre gas, 5 sp. Allison auto
3.73 rear end
Mag-Hytec rear diff cover
Amsoil Dual by-pass oil filtration system
Amsoil synthetics all around
265 watt AM Solar, Inc. system