Hi Darryl,
Provided that you are OK with weight - a few GVM threads happeing right now] I would take the trailer. While many places are OK to leave the boat etc as they are within sight, many are not.
At this time most dams in QLD are full, so you won't need to go too far, it's still a pain in the a$#@ to have to take/put in everything from the boat each time you want to fish.
Fishing in most rivers etc will require you to travel to a ramp to put the boat in - not sure if the trailer is registered but it should be if travelling on public roads.
We rarely take our tinny [wife not keen on fishing] but when we do, I have a set of transporter wheels that clamp onto the side of the boat, nicely balanced it is easy to move the boat short distances to & from the water's edge.
Have fun on your trip,
Hem