Considering purchase of a new 2500 6.4 Big Horn for towing travel trailer or small 5W. Will have to custom order. Working with dealer to specify the options (2021 models are no longer built, and the 2022 build options are only visible to the dealer.) My question is about the alternator options. I believe the standard unit is 180 ams. There is an option for 1 220 amp unit, and also an option for dual alternators producing 380 ams together. If you got one of those options on yours, why? My idea is that it would be nice to have extra capacity to charge the trailer house batteries, but to do that right I would have to install a special regulator. Any thoughts?