I did use chains for one year but most times I just had a bed full of firewood to help with traction. I would take care a big drifts a little at a time with the plow angled away and if the snow was really deep I would keep the plow about 3-4" above ground for the first pass. My 2019 Pro MX has less issues as it weighs 500 pounds more on its own with an extra 4 inches of ground clearance but it also needs a 6 foot plow just to clear the wheel tracks when the plow is fully angled
Even those Titan heaters aren't as good as they were many years ago
You might want to look at the propane heaters for golf carts that go into cup holders, I would worry about them melting the soft cab. I put an Inferno heater in my Pro MX but even the MX doesn't heat up real fast or pump enough water through the system to get my cab toasty warm but it will melt the snow off the polycarbonate windshield in weather colder than 10 F and the Pro MX was only $3000 more than my 610 back in 2006
I used a Mule 610 for plowing snow for about 12 years using a steel cable and that was with a 66" v plow and only broke the cable once. On my Pro MX I have a 72" plow using a winch with synthetic and have broken that rope at least twice in less than 2 years of plowing. I am considering going back to steel cable/roller fairlead/or using a winch strap made for a boat trailer
I plow snow with my Pro MX and it did very well although I didn't get to plow much over 6-8 inches at once. I pulled a snowmobile uphill through 6 inches of snow and did slip some with 4x4 and differential lock on. It is a nice ride on the trails but not as nice as the Pro FX models with the wider and longer wheel base.
My father had his picked up early yesterday and it was dropped off about 5 pm yesterday. I don't think the change to the ventilation system is going to fix the problem as it is still likely that condensation will freeze in the new breather system
I paid just over $7000 for my 2006 610 when it was new, my new pro mx was just over $10,000 and I think it was worth it, but I also sold the 2006 for $2700. The largest dealers have the bigger discounts