Welcome to wonderful world of rc heavy commercial Wilson, I'm sure you will find it as entertaining & challenging as I have for the last 20yrs. The hobby has certainly evolve into something for everyone to participate with & to build whatever you want for a truck, trailer or construction equipment.
There's an RC Truck Club right in Perth, if you were previously unaware, about 60 members that meet twice a month & put on a couple shows for the public every yr. Here's their Facebook group to bring you up to date of what they've got going on.
https://www.facebook.com/groups/1443510132348607/