Hi,
The Yanmar is interesting. At least they have rollers on the bottom to carry some load unlike many other things I've seen.
My ususal beef about rubber tracks is not that they're made from rubber, it that they tend to be wrapped around wheels without any rollers. So, the load is carried just like the wheel tractor they are derived from. Not much good to make a dozer out of from my POV.
Something I don't like about tractor-derived crawlers is that they tend not to employ steering clutches. They rely on differential braking of one side or the other, splitting the power.
I had a Terratrac GT25 at one point, and while it had steel tracks, it steered using differential braking. It stunk compared to the 420c, for many reasons, but it really was bad because it had this nasty habit of speeding up in a turn, where it tried to whip-end the operator off of the thing.
From the Yanmar website, they're not exactly steering with brakes, but by operating the differential such that it slows one side and speeds up the other. I can't help but think that the end effect would be the same as that old Terratrac - trying to toss me into the weeds in a turn.
Besides, no steering levers? I'd feel....lost.
I also see nothing about dozer attachments, either. I note that the track frame is pretty short, kinda looks like a 420c 3-roller to me, so perhaps a dozer is a bad idea on one. That would make the thing useless to me.
I'll have to eyeball the SAME offerings. I recall way back in the late 1970's when we had SAME alongside Deere at our dealership, and my impression (which is really from my dad and uncles, since I've never had one myself) of the brand is that they weren't worth the powder to blow them up.....
Anyway, perhaps I ought to modify my lament. I want a 4720 tractor on a 440/1010 5-roller sized track frame, with a PAT blade option.
Toss in wet steering clutches and I'll sign up tomorrow!
Later!
Stan