My blackstone 17 inch griddle is on the way. Camping World had them on sale ($73.00). I also bought the blackstone table to go with it. I also got a 12 foot propane hose that quick connects to my motor home's propane system and the blackstone griddle.
We have similar, just the 22 inch. The 12 foot hose is long enough to keep grease splatter off the rig. We have the fitting on the blackstone which removes the regulator, but we still carry the regulator in case we need it.
We have the legs, good investment. We have the soft cover. Works great. We have the hard lid also but never used it or mounted it.
Looking to get the Faulkner low pressure grill that was in the link someone sent earlier with the Aussie in it. It's specifically setup to work with onboard propane. No conversion needed, just a quick connect which we already have.
Posted this in another reply....here's result of WebberQ 1200 after converting with the converter kit (around $70) [easy to convert following youtube directions].
Here I'm using 2 of the griddle accessories (it comes with 2 regular grill grates). However, they designed the griddle to use only one with a grate. In order to use to griddles you must grind the inside tabs off on one of the griddles or one will slant (good luck putting cracking eggs on a slanted griddle!). [note in pic one of the griddles has tabs removed-left one]
Here is our breakfast with converted grill connected to RV using 2 griddles - which we find using most of the time (except for chicken burgers or steak).