I recently got a grand trunk UL from Amazon for 20 bucks shipped. I was going to rig it for cold weather backpacking as my other 3 hammocks have attached bug nets. Today, however, I got bored and decided it would be nice to have an indoor hammock so..
A trip to Menards yielded 4 - 3.5inch Spax power lags, 2 tie down attachments for lashing down ATVs
I actually snapped a #30 Torx driving these in even with drilled pilot holes.
The lags are rated at 1000 lbs pull out, 1700 lbs sheer load and there are two per tie down. The tie down themselves are the weak link, rated for only 900 pounds each.
I pulled with all my might on each anchor and could not budge them a nanometer. The don't build em like they used to.
This was an empty room. I have had the heat/cooling duct sealed since I bought the house. I was going to turn it into an office "eventually". I still can as i can take down the hammock and stick it in the closet at will. My house is around 100 years old so it took at bit of doing to find the studs under the plaster and lathe. Stud finders were entirely worthless. I resorted to the old school method of a strong magnet on a thread and, Bingo. There is a big 40" by 60" window beside the hammock and a 30" x 60" at the head of the hammock so I can try out my summer setups in doors now.