Since you have no replies yet, maybe this will help.
On the Journey, directly above the generator there is a fairly large elect. panel that is held in place with 4 twist off fasteners. The Trik L Start will most likely be installed there.
If you do not have elect 110 available when it is in storage, as I do, a simple wiring location change from the house battery disconnect solonoid to the battery isolator will enable it to charge your chassis batteries by stealing some elect. from the 10W solar panel.
It is designed to maintain a fully charged battery, not to charge them.
PS Applejack has a 2008 Ellipse.
2002 Winnebago Journey DL 34 ' Cat. 330 hp
Great wife and Charlie, Cavalier King Charles Spaniel RIP