The springs could have been a cause of your problems, most only have so a couple of inches travel before they pull up and go solid, in realy heavy weather.
Have seen a lot of vans etc lose annexes and tents lost this way over the years, when ours using O Rings kept on allowing movement and gave with the higher winds .
O rings can be had from concrete pipe / plumbing suppliers for about $2 ea, approx roughly 150 mm round and 12 mm thick, never had a failure using rubber, yet in well over 40 years .