Hi David,
I just received my
B2910 with R4's. We also have a predominantly clay-type soil (with a lot of rocks). I currently have a LA402 loader installed and have a Woods 7500 backhoe on order.
Since I just got my machine, I only have a couple of hours experience with it, and I'm not using mine to cut the lawn.
I have noticed very slight "compaction tracks" on the lawn the day after driving my tractor over it. Keep in mind that we have had a lot of rain in the last week or so, so the soil is soft and a bit "squishy". I know that has a lot to do with it, 'cause if it dries out, the ground is as hard as a rock. I doubt there will be a problem once things dry out.
The backhoe adds about 1,000 lbs. to the weight of the machine, so I'm sure there might be an even more noticeable effect on the lawn with the extra weight.
My guess is that if you'll be using the machine for cutting the lawn, the backhoe will be removed and you could even quickly remove the loader, if you want to shed a lot of weight.
One other option someone else once mentioned on this board is to buy the tractor you need for the heavy stuff, then buy an inexpensive MTD or Scotts (made by Deere, I think) garden/lawn tractor to do the lawn. I guess that depends upon how much lawn you have to cut, but the low-line lawn tractors are cheaper than the mid-mount mowers for the larger compact utility tractors. Home Depot has the Scotts tractors.
I also have to say that I was watching interest rates and wondering what Mr. Greenspan would do, and finally said: "The heck with everyone else, this is what I want." and went out and bought it.
Of course I'm a bit biased toward Orange, but whichever machine you get, you're sure to love it. I can't believe the power that is available in a machine this size.
Good Luck
~Rick