Currently running a 125Amp alternator in my stock 2013 3500HD (don't get me started on why such a lame a** alternator). Want to replace with larger alternator to help increase amps going to my DC to DC charger in my 5th wheel. I find 250-300Amp alternators on the webs, but would appreciate any input you guys have on what you suggest. What brand do you recommend, and what size? Also, does your recommendation mean a smaller belt?