Have mine in the house with a crawlspace. I put 4x6 beams with 4 jack posts under the house with cap blocks prior to putting the safe in the house. Seems to be solid. I wouldn’t recommend the furniture dolly’s. I have a nice indent in the floor where we rolled the safe in the house. Luckily it’s not that noticeable since we moved furniture to cover up the nice line in the floor. I recommend 1/2 in pvc pipe to roll the safe in place.