[AZMont]

I have the same situation with my 2015 RL 3100. No gravity fill port and only the vent in the rear wall. I made a pressurized water filler for when we dry camp from a 12v rv water pump. I fill the water tank thru the city water port using the my pressurized water filler. Also had to run a fused 12v plug from the batteries to my utility cabinet to power it. Here is a picture of what I use.