Mbarrette,
THANK YOU !!!
I really appreciate you not just discounting a potentially hazard or deadly situation!
So many people ignore good advice
and bad things happen!
Dealing with a steep grades and a load, My first choice would be to opt for a Cat to run up and down the hill, but sometimes we got to use what we have on hand!
I have mine set up for hill and grade work, low profile, extra wide tires help a lot.
with yours I would load the tires, also weight the rims, weight the front rims and front end with enough to help keep traction for steering, keep all the weight as low as possible.
I would also run cleated or studded chains, they will add 100% more for the tractive effect than just rubber.
Put a momentum brake controller in it like a prodigy, they work great and also mount it within easy reach as to be able to manually add more braking effort if/and when needed.
It also would help with braking if you chain the trailer wheels with a standard set of chains too, they need traction or they will slide on hard braking.
Another thing you could do is to put a strait shank ripper bar on the 3 point of the tractor, things get out of hand you drop that and your going to get strait and slow down immediately, you can get them set up where they miss the drawbar!
Be safe, no one like brown stains on the seat
or worse yet a upside down tractor!