<font color="red">do you think I'm making a mistake? - I know that the Walker will be no problem even in Wet on 90 plus percent of the property
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I have had the ZTR for 2 years. I have only had the PT for 4 mowings. My experience is that I do more turf damage with the ZTR than with the PT. The advantage (and disadvantage) of the ZTR is the ability to turn "zero radius". I have a number of areas where that is desirable and where I have bare spots from scuffing the turf. Second, on the Toro ZTR the drive wheels are significantly unloaded when moving downslope. In wet conditions, or even in certain very dry conditions, the unit is more like a sled than a controlled vehicle when I get moving downslope. I try to avoid working downslope but sometimes it is just unavoidable in my circumstances. Working cross slope with a ZTR gets more difficult as the slope increases because the front end has pivoting wheels that want to turn downslope and the only control is the differential drive speed of the two drive wheels. Mix that with wet grass and it can be very difficult to control.
What tire pressure do you use with the PT. I use 8 psi or less--PT actually recommends 5-6 PSI but on steep slopes there is so much deflection I am concerned about maintaining the bead seal. I have had significant pressure loss when mowing and added sealant to try to control the situation.
Again, my advice would be to operate the machine on your property in the conditions you typically mow prior to purchase.
As to your mower deck--it looks interesting. I think the general quality of cut of the PT unit I have is good but it is seriously deficient on scalp control. The Lastec deck looks like it would be much better