I am not familiar with this model of RV but where are your propane tanks located? Can you route a hose from the tanks after the regulator down to the bottom of the chassis? If so you can run a black 1/4 or 3/8 ID pipe to your location that you want to end up at from this hose. Support the pipe with a good quality hangers that are a similar metal as the black pipe. Than add a shut off valve and quick connect coupler for you gas line to the cooker.
This is how this was down on my previous 318SAB Cougar 5th wheel that I owned. I also had the dealer add a quick connect coupler and shut off valve to my 34RL cedar Creek 5th wheel also. The propane hose is routed down to the under side of the chassis and a black pipe is routed to the propane appliances from underneath.
2016 34RL CC; 2008 Ram Mega Cab 2500HD, 6.7L, 68RFE 6 speed, 4X4, Smarty S67