we've got the Hoffman Monty 3300 with the assist arm and can't imagine how you'd fit low profile tyres to 19 inch rims with out the arm, ITS A MUST. Very good machine and i think it takes upto 22inch rims.

Our balancer is a john bean balco but couldn't tell you the model number but is still made/sold today but i think only balances upto 20inch rims althugh i've only needed it upto 19 inch so far.

Both machines have been reliale and parts seem easily available.