Thanks guys for your input.

I have used the pebble method in the past and was just wondering about the clips as I see them in stores. It seems that the EZ Grabbit and gripclip work on the same principle as the pebble but may be less stressful on the tarp as the tension seems to be more spread out. From looking at the videos, the grabbit or pebble approach may be more secure than the clips.

Any other feedback is appreciated.