Donnie, as long as you are not over taxing the alternator with electrical accessories they do fine. That is not to say they don't fail, and when they do on the road you can be in for a few days until a shop gets one. Been there, done that.
Having much experience with alternators (a whole different story, and one that I am not allowed to forget), they will take up some room to carry as a spare but it can be done. Been there, done that..too.
Anyway this is the one I bought when moving to a high output. Many many years ago on my previous 1500 I purchased a Compufire & it's battery but that is a costly venture. The Lactrical alternator works great, and there is no need to match a special battery, and it provides all the power we need for accessories including heated gear.