I made my own wheel weights from old cast iron olympic weights. The older 33lb olympic weights fit the diameter of our wheels perfect. so I took one of those, and one 50 lb non olympic and welded them together. (83 lbs per wheel) I drilled them for the bolt pattern but have not installed them yet. I made them for my turf tires and ended up trading them for filled ags. I was amazed at the difference the filled ags did compared to the unfilled turfs. Before it was just spin, diff lock on in 4x4... now it just bites and goes, unless I'm taking a huge bite with the box blade. I'm still going to install the weights when I get the loader functional.
I would think it should pull it just fine. our machines are very light in the front. For my box blade, I used 175lbs up front and that seems to work, and it could still take a little more. I think you'll be surprised how well it will perform with filled rears and 150-200lbs up front. I know I was..