At almost 40 HP, that's a pretty big tractor for 6 acres.
Tell us more about what you want to do.
When you say "cutting high grass", are we talking about field or lawn area?
How much dirt/gravel/rocks... do you need to haul? Is this for a certain project or ongoing over the years?
Can you give us an idea of where you live? This helps us consider ground conditions, weather/climate...
Small minds discuss people.
Average minds discuss events.
Great minds discuss ideas.