I have 2 steiners at work(420's),very similar machine made by the same people. I have friends with the Ventrac.Im told the 31hp L/C gas engine is the way to go in them.....It lasts the longest,is very smooth,and has the most power.I have never used one,but a few ppl have said the diesel engine beats the machine to death with vibration.Also told that since the diesel spins at as fast as the gasser(RPM) it isnt much better on fuel....Id do more research before committing to spending 26K on one.I see clean used ones here and there,i wouldnt hesistate to buy a clean used one as well.
I lltell you this,my steiners will climb anything you can walk up,and sometimes they will climb up stuff to steep and slick to walk up without spiked shoes....With the duals they are incredible,but the outside tires restrict tight turns and trimming ability with the deck.I only have 60" decks,if i had a 72" the deck would be as wide as the duel wheels,it wouldnt be as much of an issue.I also have the front end loader,a homemade dozer blade,and a front mount yorkrake.Many of the drivetrain parts are identical on a steiner and ventrac,Ive run my steiners all out,and my old one has 10000 hrs on it,I drag 2000lbs of mowers with it in 90 degree weather for 8+ hrs straight in the summer,and put 30 hrs a week on it,it is still going,on engine #4,but still strong.Amazing machines.