Yep watch the down hills espec going into cnrs and traffic.
Traffic keep those distances in front 'generous' something happen up front, happen to be looking at something in a feild, still have enough time just to lift off accelerator, and slow down without braking... thats a good distance towing or not.
Close following doesnt get u there any faster.
Braking down hills and not enough or far too much weight vertically on the hitch will cause disastrous results under far less extreme conditions than you think.
load up and take for a drive before actually going.
An acquaintance recently towed, on a regular basis a 6m fully loaded lotus ( a heavy boat to start with) behind a camry Auckland to top of the coros...in experienced at towing , just thought the feel of the load and lack steering ( vertical weight on hitch) was "normal"
reconed was safe could not go too fast as the trailer would sway
Happened to see the set up on one trip when he got home..
could not believe how got away with it, getting a ticket, most probably taken off the road....
I wrote up a post while back about balancing a boat (load)
Essentially get the hitch weight in spec.
Fully loaded, maybe a trip to ramp, via a few hills open road. Take a few pre made timber/ ply shims that fir between the rubber the boat bow fits into and the post. If get any sign of sway, stop, and swap out the shims till no sway under any speed (legal or not)/ circumstances.
Shims will be a 3x2" block down 1/2" ply.
A little care and effort makes even frequent short trips to the ramp so much more comfortable , stress free, long trips even more so... and the side benefit of safety.
Do not skip the trans and brake services in above post...espec older car... and no a simple WoF compliance is not enough.