I dont remember exactly what we did, but i remember we had a situation where one of my fellow players was a centaur. The dm ruled that if you were to use a battering ram while riding said centaur, both your strengths get added together for the check. The person riding the centaur has something that enabled them to more effectively use tools they were holding, i think it was if they used a handheld tool they got advantage with it. And then we had one more player who was a turtle person. As long as they were in their shell they got a ton of defense buffs. So, we had player 2 hold player 3 while they both climbed onto player 1. We then proceeded to use player 3 as a battering ram against a magical door that we couldnt figure out how to open. After rolls went through, we ended uo blowing the door down so violently that is killed most of the spawn in the next room