Yeah, that would suck. And it's a good point. Currently, it easily supports the 134lbs of battery when I put two "normal" 12v deep cycles. Mine are 67 lbs each. Is 24 lbs enough of a difference? I don't know, I hope not, but I'll have to figure that out. Or maybe reinforce for good measure. But I think most who have dual set ups, especially GC batteries, are probably fairly close to this weight already.
So if I discount the weight thing (by reinforcing and distribution of weight on the hitch), is there any downside to using this size battery? I guess I'm wondering if 12v is 12v, regardless of source. And if people don't use these types of batteries because of size and weight alone.