JIMNLIN wrote:
Your 2016 Crusader may have a pigtail at the trailer rear for that purpose as some of the newer trailers have.
I wired into my trailers running lights at the rear for my boat trailer lights.
Now if your boat trailer has brakes you need a controller in the truck that can handle 3-4-5 axles which ever the case (rv trailer + boat trailer).
Very few boat trailers run electric brakes (although they do have some advantages). The vast majority are surge brakes. No need to do anything different here. And if you have a newer truck, most will run an additional 1 or 2 electric brake axles anyway.