Binders do great. Incarnates do great, though they suffer a bit at higher levels. Both can tank for you, and aren't that equipment dependent. My ideal WLD group would be:
Binder, Incarnate, Beguiler, Cleric, Dragonfire Adept
At low levels, that gives 1 trapfinder, 3 tanks, 1 battlefield control, 2 faces, 1 healer
At high levels, that gives 1 trapfinder w/ 1 backup, 2 tanks w/ 1 backup, 1 healer w/ 2 backups, 1 battlefield control w/ 2 backups, 2 faces
Adding a Psion would be good, too. Also, there's this factor: you're in a stone dungeon, and all dwarves get trapfinding for stone-based traps (whether the trap is made of stone or if its set in stone), therefore any dwarf w/ a base-class w/ Search could probably do 90% of the trapfinder's job (mundane free-standing traps, like you'd find in wooden chests, are still an issue). This includes Wizards, Psychic Warriors, Dragonfire Adept, Bard, and of course the standard ones that have trapfinding already. I'm sure there's some feats that add it as a class skill, but I've forgotten.
This party only has 1 major equipment sink: the cleric. The rest don't need equipment to do their basic functions successfully. I prefer the diversity of the Incarnate to the Totemist, but its a minor point, and they function fairly similarly.
Don't forget that once you get Fabricate, the access issues in the dungeon can go WAY down if you have just a few feats (Psionic Fabricate goes REALLY well w/ a Warlock / Chameleon).
If you can, the Warforged is a great race to play: the immunities, the auto-stable, and the natural attack are all awesome.