Battery maintainer

I run Battery Tender Jrs on everything I own. The .75A they put out is more than sufficient to keep up your batteries. On our Class A I used two. One was hardwired on to the chassis battery and one to the house batteries with the power heads in the power cord compartment on the opposite side of the RV. When I would get home I would do all the normal post trip necessities and then turn off the battery disconnects and plug in the BTs. When we were traveling and in a CG I would only plug in the chassis battery BT if we were going to be in the CG for an extended period of time. I currently have 1 car, 1 tractor, 1 mower, 2 boat batteries (still in the boat), 1 DR grader, 1 hybrid trailer and the break away battery on my 6x10 trailer on BT JRs. I have very few battery issues and never have to worry about losing an ECM because the battery dies and issues occur on start up.
I use BTs because I found an inexpensive outlet for them. There are other companies that make low amperage maintainers. The trick is the low amperage. There is no need to put more amperage in to a stored battery.
Randy