You'll break the plow long before breaking anything on the ATV. The problem with using a snow plow is that you have no down pressure and the shoes will keep it from digging at all. So you may want to remove them. Pushing a bit of light material around is not going to be a big deal.
actually you can adjust the skids to be UP and plow blade to ride level like on the ground without removing them(or I can)
as for down force of blade
YES and NO
and I say this, due to when weight gets in front of blade, it pretty much drives blade down, SO much so if you have enough weight in front of it, it will trip the plow over on you
I have never needed down force on a blade pushing dirt.stones or??
as your way too limited on what you can push due to the plows design to trip when it encounters "X" forces
NOW if you wanted to BACK blade plow, then yes 100% it will just ride up top of things due to too light and no force holding it down on you!
as for breaking the plow before the ATV
I say NO<, you can for sure break the atv first, , you can over heat it , and well, ?? motor life cut shorter> you can strip axles and blow rears if you get too wild and start pushing and get wheels a hopping and DON"T let off(seen dummys do this LOL)
I hit a cement curb once at about 30 mph with plow blade, sheared off a grade 8 bolt and stopped atv dead, and about launched me
plow was fine, I did dent the atv's frame !
SO
I don't think, pending plow again, that, you will damage plow first!, its a 50/50 deal there
I have never damaged my blade to date, but sure I have added a few extra yrs of wear and tear to my atv from what all I have done to it using the plow as I do LOL
But to date both are still ticking just fine!
I live by use(some times abuse) but do PM's often! and use good oil, to help off set maybe the abuse??