#1 Robbie should know more (he is the hunter) I am the camper guy
#2 if it's there it's there eitherway is fine, your camper will have it's own battery so not need for travel trailer.
#3 from what I understand snow package will have heavy-duty springs up front similar to a 3500 spring and may or may not have the extra alternator.
#4 exactly as stated and way cheaper than after market, takes up no bed space and is a good resale point for some of us.