Hi,
I'm assuming your dealer is refering to a "boxblade". A good, heavy boxblade will be a bit more than the toothbar and does have the disadvantage that you'll have to remove the backhoe to use it. However, on the plus side, I think it might work better than the loader/toothbar combo and the boxblade serves as a good ballast for other loader operations.
On the other hand, if you hit a stump that will require removal with the backhoe, you'll have to return later to take care of that. Actually, it might be better to go in first with the backhoe and remove the big stuff, then use the boxblade to smooth out all the bumps.
I don't know what's involved with removal of your backhoe, but on my
B2910 with Woods 7500 and subframe, I can usually mount or dismount the backhoe in 10-15 minutes, depending mostly on whether or not Mr. Murphy is looking over my shoulder. Putting on the 3 pt. hardware is another couple of minutes.
One thing that helps is to remove the backhoe on a paved, flat surface. I keep mine in the garage on a dolly, so it's easy to maneuver when off the tractor.
I don't have to worry about trail maintenance, so I'm just speculating here.
~Rick