Gump's right. Those things work fine, but you'd better have them secured very well, AND baby sit them throughout a wind event.
Frankly, I'm just baffled at the number of people who will have a $100 K sitting out at the airport, and never even go out to see if the tiedowns are tight during a big wind. Or people tying their airplane down with crappy OLD Walmart rope that's been laying out in the sun on the airport ramp for years....or....
When we finally built a hangar for our planes in Kodiak, I was so delighted that I'd only have to tend MY personal airplane all night the next big blow. What a treat!! I can't count the number of times I spent much of the night baby sitting airplanes, and I rarely saw another soul out there.
Maybe I'm just not the brightest bulb in the fixture....or didn't have as good insurance.
As to propping up the tail--It can work, BUT....
1) You've got to LIFT that tail to get it on the support--Bring strong backs to help
2) You have to REALLY securely tie the tail down so it CANNOT move. If it bounces around and comes off that prop, the prop will most likely destroy the horizontal tail.
3) Which means you need to baby sit the airplane any time the wind's blowing hard.
Granted, these kinds of winds don't happen often in most parts of the world, but they can, with thunderstorms, etc.
Get VERY good tiedown rope--I use climbing ropes. Learn how to tie a good knot.....DO NOT use chain tiedowns--they can destroy a plane as well.
And, most of all DON'T EVER EVER use cable tiedowns. And don't tie your plane down downwind of cable tiedowns either.