You could easily go to a 20 x 8.00-8
that will give you about the same footprint patch, ground pressure, and with having 2 inch taller tire, you gain 1 inch in rear deck clearance, if you could raise the front at the caster wheel swivel you should be about perfect for what you want...
Or a 20 x 10.00-8, that will give you the same added height but it may cut your traction as it increases the width along with the length of the footprint, thus giving you less traction, unless you increase the weight of your tractor... :smile:KennyV