We did similar in our last fifth wheel, except had the regulator with "T" and additional spicket that installed at the supply. I just made my own hoses where they'd be just the right length. No doubt, if you have a wet bay, this is the way to go. Much simpler and keeps the wet bay, not wet.
John and Rebecca Dickson
Emma-8 / Little John-5 / Iva-1+
2013 Ford F-350 Lariat FX4, CC LB PSD, DRW
2015 Jayco Jay Flight 28BHBE (#8)