Our manual actually states that our chassis batteries are charged when on shore power.....but after checking with Monaco, they informed me that the same manual is used for different models, but not all models are wired the same. In my case, the chassis batteries are NOT charged when on shore power (I must have the cheap model).
I initially bought a trickle charger, but it was cumbersome because in order for it to work, required 120vac which, in my case, required me to run an extension cord from my electrical compartment under the motor home to the battery compartment.
I then heard about the
Trik-l-start here on rv.net. Purchased it and then installed it in about 5 minutes due to the fact there's only three small wires to connect. No problems with chassis batteries going dead ever since.
Ron