Two suggestions: (Well 3 but only two for today.. the 3rd is for later)
First if your RV has a good 3-stage converter... Plug it in If And tomorrow you will be charged. A good 3 stage job like a Progresssive Dynamics wizard controlled.. No reason to unplug just leave it on full time.. Mine lasted 12.5 years.
If you do not have a good 3-stage or if you are on the bench.. When my 9180 died it was Sunday and getting those puppies up was .. Well important.. So I headed to the local Auto Zone (closest discount auto stuff shop) and picked up a really nice Deltran Battery Tender PLUS.. PLUS boost,, PLUS jump start
This sucker can deliver 1-2 amps in "Tender mode" (leave it plugged in forever)
20 amps (Battery boost... takes 'em up to 14.1 and then shuts off.. I am not sure if it then defaults to "Tend" or if you need to reset it
Or 70 amps for jump starting.
WI-FI link to my Smart phone or Tablet to control the beast, or you can do it from the on-board panel
TOok me (over 500 amp hours and way too low on charge) about 24 hours to fill 'er up
Next day I drove to Tekonsha MI (about 12 miles from Marshall) and the day after I took car, and dead 9180, to Progressive dynamics.. Returned with Nice Refurb unit and installed it.. WORKS GREAT.