Not a Guru by any means but here is what I did that seems too work . I use a live feed to a lighted switch on the dash to activate the continuous duty solenoid . That allows me to open the 4 ga. line between truck and TC without the truck running so I can charge just TC batteries ( switch closed ) or both ( switch open ) when plugged into genny or shore power , same option while driving charging from the truck alternator . Much depends on the capacity of your existing converter/charger . I'm using a 50 amp Iota and it seems to do the job , but I am rarely stationary for more than 3 days and no AC .
PS enjoy the Expo , wish I was there .
