I think the 122 they included a full tank of fuel and a 175lbs operator.

 

I'll have to dig around and see if I can find the specs. in the morning but all 4 of them should be within a few pounds of each other getting a little heavier going up in the model numbers. The 122, 124, and 126 are basically the same machine just different generations of it. The hood, grill and dash changed each time the model changed and when the 126 came out they changed the fenders too. The 125 is the same as the 124 except it's a hydrostatic trans. instead of a gear drive like the others

 

From Hank Will's Cub Cadet The First 45 Years book. You should get a copy if your a Cub nerd like me lol.

It's basically the Cub Cadet Bible. Here is the newer version. https://greenmagazine.com/product/50-years-cub-cadet/

Or on Ebay https://www.ebay.com/itm/50-Years-of-Cub-Cadet-book/322525313953?hash=item4b1801bba1:g:xa8AAOSwWTRWyzUh

122 is 800lbs with 175lb operator and fuel. 800-175=625 2 gallon of gas @ 6lbs per gallon =12lbs 625-12=612lbs dry weight

Options add weight. Headlight kit will add a pound or 2. Creeper gear another couple pounds. Rear sleeve hitch is another 8lbs or so. Hydraulic lift is another 15 or so pounds.

 

Thanks, I appreciate the info.