I have a Kubota B7800 with R4 tires and a 6ft rear mount rear discharge finish mower. Initially when I got the Kubota, I wanted to have as light as possible tractor and did not get the loader, and did not have my tires filled with liquid
ballast. The B7800 weighed about 1750 pounds. I thought I would be able to cut most of my lawn with this combination but quickly found that the tractor was still too heavy and I was getting depressions in my lawn from the tractor tires. Another problem was mowing around objects, the front tires would sometimes tear the turf if my steering created too tight of a turn, and forget about trying to turn when 4wd was engaged, turf damage was much greater from the front tires when steering even into gradual turns. I still use my finish mower, but it's not on my lawn, but on an old hay field that I mow a couple of times a year.
A finish mower on my Kubota B7800 did not work well for us for cutting our 2 acres of lawn. We had to use a mowing platform that is about 600 pounds or less, so the Kubota BX series or even GR series would have been too heavy.
For year used two Wheel Horse GT riding mowers but needed to find something with better traction that could handle our steep slopes, something with 4wd or AWD.
Currently my wife and I use two Husvarna R322T AWD that weigh 570 pounds each, have articulating steering (really nimble around objects) AWD for excellent traction on steep slopes and do not tear up the turf.
Good luck