If you can get into 26" rubber it will help for sure,
esp if you can get them filled with fluid.
that ramp/stairs looked scary! when i had my 445,
with rear tires loaded, it was well over 1000 lbs,
i would have had a hard time taking it down
that ramp, too much pucker factor for me! although
you had a relatively soft landing at the bottom
with the snow. i expected the hitch to really dig
at the bottom, but it sort of glided and you made it
ok.
that snow looks like it was very heavy, and with any ice
underneath, it will be hard with that tractor to really be
effective. once you establish a frozen base, and get some
lighter snow, it will work great. maybe you don't get that
cold during most winters though. we have been very cold this
winter, and my driveway/base was probably 3" thick in places,
but being hard packed snow it worked well for traction for
cars and vehicles, until it rains that is.
congrats on the new tractor.
oh, one thing to check out. pedal travel, for your hydro.
see if you have full reverse, use a short rope and when going backwards,
wrap the rope around the forward pedal and pull up. if you have a "lot" more
travel with the rope, you may need to adjust the bracket under the
footrest to get those pedals back up thru the floorboard further, giving
a little more pedal and ground speed in both forward and reverse.
I "adjusted" mine a couple times while i had it, with long bar or
sturdy board, prying up on that bracket that the pedals attach to under
the floorboard there.