Dr of BBQ
At the front of my trailer I ran hose to my propane heater from the black iron pipe. In the back, (didn’t do both at the same time) I ran my BI line through the floor and put a flex line on my char broiler and just this year ran a hose to another propane heater. But that’s Illinois, and we get one fire department inspection and that’s it.
If you don’t think the fire department is going to cry foul go for it. But I’d check local regs if you can find them online.