I love martial characters, but could you give us a bit more info? What books are you allowed? What are his ability scores? Let me rephrase your multiclassing, we can only have 1 prestige class and as many base classes, right? Or is it strictly, 2 base classes and 1 prestige class? Also, do you want him to be focused on spells or maneuvers? Or would you prefer to have some other type of fighter trickery?
I'll assume everything is open for now:
Since you want him to be a tank and you're using glaive + armor spikes, I figure you want a lock down build of some sort. This is what I assume your build is going to be using the strictest multiclassing rules.
Cloistered Cleric 20//Crusader 5/Ruby Knight Vindicator 10/Crusader +5
Feats:
More focused on spells.
1) Combat Reflexes, Stand Still, Extend Spell (Planning domain), Extra Turning (Undeath Domain), Knowledge Devotion (Knowledge Domain), Persist Spell, DMM Persist
3) Extra Granted Maneuver
6) Extra Turning
9) Extra Turning
12) Robliar's Gambit
15) Extra Turning
18) Extra Turning
Tactics: He'll be a full caster from Cloistered Cleric so there's no worries about losing spells or caster levels. This build is fairly simple, at the beginning of the day, he casts as many persistent spells as possible (Mass lessor vigor!) to make himself into a walking Crusaderzilla. Make sure that he casts a persistent enlarge person on himself. A MAD build, but the persistent buffs help alleviate it.
More focused on fightin'
1) Combat Reflexes, Stand Still, Combat Reflexes, Stand Still, Extend Spell (Planning domain), Extra Turning (Undeath Domain), Knowledge Devotion (Knowledge Domain), Persist Spell, DMM Persist
3) Combat Expertise
6) Improved Trip
9) Holy Warrior (Complete Champion)
12) Robliar's Gambit
15) Defensive Sweep
18) Overwhelming Assault
Tactics: He's more of a melee threat now. Knowledge Devotion and Holy Warrior will help boost the save DCs of stand still by tacking on some extra damage. He strikes normally, stand stills, then trips. Then with his improved trip attack, use a white raven maneuver to give your summons an extra boost. On the downside, he'll only be able to persist maybe one or two spells unless your DM allows nightstick stacking. This build is still very MAD though.