I have 2 X 6513's HSRP'ed as my core switches and have about 50 VLANS. I have the vlan interfaces configured with standby priorities set trying to alternate the HSRP "active" interface in an attempt to load balance between the two switches. I then configured "spanning tree vlan ## root and secondary" on each core without taking into consideration which one was "active" in HSRP. Although I've seen no impact, does this matter? Does one protocol override the the other?
Does each VLAN terminates as an SVI with its own HSRP group ?
you can always have more HSRP groups, matching STP roots.
So VLAN 2-10 with RTR-A as root with A as Active, and VLAN 11-20 with RTR-B as root and Active.