I know that on my year model, the 180A was the biggest output I could go in the stock casing. Going to 200A for me meant a different casing. I didn't want to do that because I wanted a simple bolt-in. I may put on a winch someday, but I was just trying to support my A/C and my 6-100W and 2-130W forward facing lights.
Don't expect these to last forever, but they will last quite a while. They use a new bridge. From what I was told by them, it is much more durable than the old days and lasts longer with the new windings.
I don't know on your bolt unless they had to change your casing as well. Only mods I had to make was to cut the old alternator lead, put on a new alternator-starter cable to support the amperage, and customize the old bracket a little for clearance for the new plug.
BTW, I am also getting ready to do dual batteries. I have been researching the WranglerNW product versus the Hellroaring. I have decided to go with the Hellroaring and will be getting one next month. What are you going with?
Brian
P.S. If you want to call these guys and ask a question, their number is 214-330-5900. I think they may also have an 800# posted on ebay. Ask for Pat. He is probably the most knowledgeable one there.
85 GMC Jimmy <a target="_blank" href=http://tx85gmcguy.alloffroad.com>tx85gmcguy.alloffroad.com</a>