There is some reg that if a tank is X number of feet from the main regulator a secondary regulator is to be place just after said tank. I guess it has to do with the possibility of the Propane gas reverting back to a liquid at the higher full tank pressure over X distance.
I know some on the Montana forum have removed it, and I had to remove mine last year when it developed a leak and couldn't find a replacement So far I haven't any problems.
Michelle & Ann
2018 Chevy 3500HD Crew Cab High Country DRW, D/A, 2016 RW39MB, Dual ACs, Auto Level, Auto Sat Dish, Stack W/D, King Sleep #, 17.5" Sailuns w/Disc, MORryde IS & Pin, Comfort Ride Hitch, 5.5 Onan, Res Fridge & Induction Cook Top