OK I'll bite.. based only on the photo, this looks like a really bad idea.
1. It appears to be very flimsy.
2. It appears that the range of adjustment is too limited. Sure, it looks OK on on the level pavement in the photo but what about the real world? As you spread the legs out for a more shallow area, the amount of support would lessen while at the same time putting more strain on the strap, which might fail. It does not look like it would work very well on uneven ground unless pads were put under the leg over lower ground, and that would make it less stable since the pads could slip.
3. By the time you get the legs in the right position, and adjust the strap to the right length, this does not look EASY at all compared to my stabilizers.
4. On
fiberglass trailers I guess it would have to be mounted on the frame or bumper, and not as it appears to be in the photo.
EDIT: I see that it got great reviews, so what do I know.
PS.. It seems the strap is not included, you need to supply your own.