j-d has stated it right!
I've been towing my Vibe on a Demco KarKaddy SS dolly for 60,000 mile, 10+ years and have had no problems with it. If strapped down right (not the way manufacturers suggest) you'll never have a strap come loose.
That said, now that I'm approaching 77 it is getting a little harder to move the dolly around and getting down on my knees to hook up but I love my Vibe and it can't be pulled 4 down. If you're getting up in years, your toad can be pulled 4 down and you plan to keep it for a long long time 4 down might be the better way to go.
Dave