Is this safe
So I thru- bolted 2 5ft unistrut to each Z purlin and 6” baseplate with 1/2” hardware. A 5ft unistrut connects the baseplate on each purlin and the 1300 lb hoist is bolted to the connecting unistrut. Harbor Freight load leveler is rated at 2 tons. Yellow lifting slings are rated at 6400 lbs each. Slings are attached to the load leveler with 3/16 quick links rated at 615 lbs each (think these are my weakest link). Then the black ratchet straps are rated at 1000 lbs each and hooked to the unistrut at the widest bolting point. One strap is hooked to the top unistrut and the other is hooked to the lower unistrut. The load is less than 250 lbs (tent weight 176 lbs and the bed rack weighs 55 lbs) I plan to leave the tent hanging till next winter camping season and pull it yearly. I also store a vehicle under it full time. Is this safe and if not please advise what to change.