The Porta-Chef has a hose with regulator and QCC connection. I used a Porta-Chef with my previous TT and bought a 'Y' fitting to go on one of the 30lb tanks and a 20' hose with a female QCC end. I wound the line around the top of the two tanks under the cover and unwinding it and setting up the BBQ was one of my setup jobs. I bought the parts at a Camping World on a trip through the states... don't know where you are in Ontario but most RV dealer parts departments have the stuff you'll need (I've seen the stuff at Sauders, McPhails, Leisure Days).
If you do have an external quick disconnect on your trailer for a grill (mine didn't) then you could, as GasMan says, remove the Porta-Chef's hose and regulator and simply replace with a suitable length hose with a quick disconnect end on it and run directly off your trailer's low-pressure rail.
2015 Rockwood Signature UltraLite 8282WS Platinum, GY Marathon LRD, TST 507RV TPMS
2005 GMC 2500HD CCSB D/A, Curt E16, Prodigy P2, Garmin RV760LMT w/BC-20 b/u cam