There were only a couple of those made. They were called Grizzly's.
Grizzly [Breacher] They were to replace the Engineer unit's ACE's, CEV's, ABLV's, and M113's. They were built on the M1 Tank chassis, which was a great step forward, but also the unoffical casue of it's demise.. They worked great, but the problem was when they broke down.. M1 tanks are fixed by M1 hull and turret mechanics. M113's, CEV's, and ACE's were fixed by tracked vehicle mechanics (but not the same ones that fixed M1's) In armored units in combat, when a tank is broken, it's a HUGE deal. You do whatever it takes to fix it. Everything else is secondary to fixing a tank. I was in a test bed unit, so we saw alot of these experimental items, and would figure out how they would play into the battle.. The problem with the Wolverine and the Grizzly was that they were on M1 Tank chassis, and the exact same hull mechanics that fixed M1 tanks could fix these.. So the BDE CDR could take the engineer unit M1 hull mechanics away from engineer units in the heat of battle and fix tanks.. This leaves the Engineer units with no hull mechanics and lots of broken stuff... That fact, along with problems with the design itself, killed the program. Same story with the Wolverine..
http://www.globalsecurity.org/military/systems/ground/wolverine.htm
Some other notable experiments of the same time frame were the M4C2V and the Armored Ambulance on a MLRS/Bradley Chassis... 2 more programs that didnt go anywere, but probably should of..
Two programs that did go on to transform the Army was the HEMTT LHS and the FRS-H. Both were adopted and have been proven in combat in Iraq.