the dual wheels are usually found on the tractors with 23x10.50 x12 tires.
they sometimes use a collar that fits between the 2 wheels where the bead is and then are fastened together with 4 bolts like used on your wheel weights.
the collar is about 2 inches wide,very similar to the collar used on semi truck only smaller.
there is another way that uses 4 small pieces of pipe that are put on over the bolts between the wheels,sometimes there are strips of steel weilded to them for stability.
i hope you can picture what i mean.
you could do this to your tractor and would work pretty good. but it really depends on the transmission you have.
it needs to be a heavy duty unit. and im not familiar with your type of tractor.
later chris
craftsman 10/28 snowblower with tracks husky 372xpg chainsaw sachs dolmar bc212 bushsaw mondo trimmer monster tractor with trailer cheep wheelbarro and couple shovels and a partridge in a pear tree