FYI Guys: I talked to Mike Stiers (from Maxxsonics) today, and he stressed that the mm4000's are NOT, repeat NOT strappable in any way, shape, or form, even with the maxx-link. He said it's just not gonna work.
He also offered his two cents regarding me possibly using the mm2000 in conjunction with the 4000. He said it wasn't a bad idea,
it's just that it would be very tedious and time-consuming getting the gains matched perfectly.
I'm still gonna take the advice of the board here though and just look for another solution. Thx guys...