I am still not clear if the adapter kit screws into/onto the big tank's filler intake and whether that is before or after the tank's own regulator to the MH appliances.
My RVQ has no regulator at all, just a high-low setting valve---it depends on the RV's regulator. The 5er has a pipe out the side which has a quick connect fitting, so the "RVQ" ran off the 5er's 30lb tanks and their regulator.
I am unclear if you had one of these adapters to do a quick connect from the big tank filler, if that would by pass the MH regulator, so you would not have any regulator for the RVQ.
I am supposing the adapter part that allows adding a 20lb cylinder to the big tank's filler intake, would then use the big tank's regulator to supply the MH's appliances? It is all too confusing, since the 20 lber uses one of those green knob things with its own regulator.