Jamie,
As we spoke sometime ago about ourselves looking into a TH, upon reading your post/question, a thought came to mind as you may have already thought about it. Tie downs. How are they attached to trailer? Just bolted into the wood floor? Thru floor w/ metal plate underneath it? Thru floor yet attached/welded to frame/crossmembers of trailer? Many sled trailers that have tie downs in floor simply bolt them into the wood to save time and money. I really never gave it much thought until we bought our last one in '14 (geesh doesn't seem like it was that long ago) and when we brought it home, we swapped w/ our sled dealer as they had furniture on their we bought for DD. He looked it over and noticed the tie downs were bolted to a plate and welded to crossmember.....he liked that. Now as for us and sleds in trailer, I simply just drive them on, set brakes and close door as we travel about 50 miles from home/ Now before I get chastised I know this isn't the best interest if involved in a accident and frankly, I'll have bigger problems than if the sleds were tied down. Mind you this is a 4 place V-nose enclosed, dual rubber/torsion axle and rides smooth. IF and I say IF this was a 2 place trailer, then yes they would be tied down. When we go long distance, then they get tied down. My point being, make sure what the tie downs are attached to underneath the floor......especially if a wheeled vehicle is in garage. If I recall right, not all garage floors are flat (which would help in less movement.....ie back end lower towards door), so IMO it would make a difference on tie downs as you're going to reefing on the straps pretty good.
Mike