My truck came equipped with a trailer brake controller and I'm about to buy an 18 foot car hauler type trailer. When I pick up the trailer for the first time should I put in some gain ahead of time? Like a 1 or 2 setting or leave it on 0 while empty and towing it home? I've read how and watched videos on how to set it and you need to be driving with the trailer to do it. The trailer dealer is on a very busy highway and I doubt I can do the setup until I get near my house. When normally towing I'll have about a 3,000 lb tractor on it.