I did this almost exactly when i moved from michigan to california. Largest u-haul available, packed to the top. Went middle of september, so it was hot. Overheated twice on hills, and had to stop when it started burping coolant. I had a couple points where I got some sway that amplified fast. Bottom line - not the safest load. Probably had ~6k or so of tow weight as much of it was tools, shop equipment and ammunition. Trailer brakes worked well, so no troubles stopping. Went 55 the whole way.
What were the specs on the towing vehicle,
do you recall how long the trip took at 55mph, straight through or hotel stops
how did you react to correct the sway you encountered/any advice on how to avoid it
off topic- was the cost of living difference between the 2 really matter as you should in a sense be paid in a similar income ratio?