I don't know about Wisconsin but up here in Ontario Canada we have some pretty strict rules concerning propane, certification to work on propane systems and getting rigs certified every 5 years or so.
If it were me I would possibly approach a certified propane supplier like I did, NOT A RV DEALER but a Mom and Pop propane supplier. They will treat you like a human being instead of raping and pillaging as my local dealer tried to do. My guys did all the work exceptionally quickly and with a lot better percision than I suspect my local RV dealer would have done.
If you do need to save some money, then ask what lines (1/2", 3/8" or 1/4" lines you need to run but have them do the final flanging and hook ups. They would also be able to suggest a replacement size for the regulator or even have a rebuild kit?
Propane is one of those nasty gasses that accumulate in low spots as it leaks, and if it goes WUFF it goes WUFF big time.
Per Mare, Per Terram and may all your campaigns be successful.
“It’s a recession when your neighbor loses his job; it’s a depression when you lose your own.” "Harry S Truman"