SWB wagon, never heard that, you mean the normal 2 door swb? my one of them is regod as a panel van, if you change the body they would want to inspect it afaik.
So ya wanna put a ute cab on a SWB chassis ???
Or a ute cab on a LWB wagon chassis ???
The front 6 body mounts are the same ,but the ute has extra mounts on the rear wall
IF these arent on what ever chassis u use,they mite need to be added
Youll get different answers as each state has different rulings
Best bet consult main roads/dept of transport in YOUR state
They will forward independant engineers to talk to