The machine shown is the basic belt drive model, hence single speed (that said it uses an engine that revs to 3600 rpm & develops peak torque at about 2400)
Belt life is about 200 hours, as they are used for both drive & steering per side. These have no bottom rollers
They do offer a much better range of hydraulic / hydrostatic drive larger machines, past models seen here
https://struckcorp.com/older-products/
On all the hydro models max drawbar pull is 3000 Lb - so divided by the 48 ins bucket width that comes out at 62 Lb per inch of width. The old IH B100 has a figure of 144 Lb per inch of width. So even the better hydro Struck loader only performs as well as an old 2wd JCB in this measure.