I have a Weber q2200 grill and I bought a quick connect hose ($40) that connects to the propane line under my MH, and screws on to where you would normally have a small green propane tank . Easy, plug and play.
Here are some stock pics of what I'm talking about.
Attachment point of hose to grill (remove green canister)
Quick connect Propane line under MH
Only problem I'm having is that the gas pressure is not strong from that outlet. Going to have the dealer look at it because it should be stronger.