Purchased a 28" Blackstone last year to replace the bumper mounted grill that didn't work well. Used it as it came last year with an attached propane tank and found it heavy and unwieldly to move around camp.
Tossed the grill, but kept the hose that connected it to the quick connect on the camper. Added fittings (with the correct Teflon tape for gas) to connect this hose to the flattop after removing the regulator/hose.
With this new hose connected to the flattop, I purchased a 12' hose from Camping World (CW item #86731) to connect the flattop's new hose to the camper. This length gives me some selection for locating the flattop in camp.
To use the Flattop at home I added a female quick connect (with the correct Teflon tape for gas) to the flattop's original regulator hose.
Shown together, the hose on the bottom will connect to the Flattop permanently.
Works well. At home I use the regulator hose to attach the flattop to a tank, on the road I use the 12' hose to attach it to the camper.