I did not do a lot of shopping for mine. This place is only 40 miles from the house, and no sales tax in Arizona on Solar Products, so that wasn't an issue
Trimetric 2025 Battery Monitoring System
You can probably find it less expensive with a google search.
2013 Rockwood 8289WS
Mods: Central Vac, PI EMS-HW50C, 2025RV, (2) SCS225 Trojans, PD9260, Awning Remotes & LED Lights, Eliminators, External Water Filter,, Intellijacks
2008 RAM 3500 Cab&Chassis Hauler Bed, B&W Companion Hitch
All My Modifications are at this link: