I can't comment about the on road stuff, but (as much as I like dealing with Austin at Maxamps) I can't really recommend their 6Ah packs. I puffed three of them in the past month or so. It appears that they cannot handle nearly as much of a load as they are rated for. I was running my 4S packs in a buggy with a MM/7XL combo with rather conservative gearing and the packs would come out piping hot.

I'm now running Kokam 4S 4800 packs and have not had any problems. I got the Kokams because maxamps was out of stock on the 5K cells and I needed batteries.