I agree completely...there ARE soils (and Conditions) that will make all kinds of different loads on a plow... My time at the "Plow Days" was probably not all that typical... I had just re-built this 630 with New Mains and rings and a VERY GOOD Valve Job that NASCAR would envy...along with New 15.5x38", LOADED, 3 wts on the left and 2 on the Rt and 300 on the front.. This was NOT any more than it needed, either..!! BUT, it DID pull it and over 7" deep in established Alfalfa and Jack Wax.. IT was every bit it could muster (900 RPM) in 2nd, at times..!! Sure seemed to shake the very Ground..!! What a HORSE..!!! My 720, with 300 lb on the front and New 15.5x38" and a couple wts on each side walks right along with that F-145" 4x16 (here) in 3rd, 7+" deep...sometimes lifting the front..!! It's not an "R", but holds it's own...!