I just beat the Tower of Dread on my first try!
My team was:
Lv. 50 Energetic Warrior
Lv. 50 Kind Mage
Lv. 50 Laid-back Tank
Lv. 50 Cautious Scientist
Everyone had legendary equipment. The highest relationship was level 37, and the highest relationship with the horse was level 64.
I didn't use sprinkles until the Evil Sage, but I did heavily abuse the Safe Spot.