I agree that 4 down is better but if you’re toad can’t be pulled 4 down, you trade toads frequently or want to pull a variety of toads a dolly is not a bad alternative. You can’t back up much either way. My Demco Karkaddy SS has served me well for 10 years and customer service has been very good. The surge brakes work fine and the fully galvanized body will not rust. The fact that the tongue can be folded back and the wheel ramps folded up reduces home storage by almost 50%. As far as safer, if it’s hooked up properly it’s no less safe than 4 down and if the straps are hooked up as suggested above you’ll never have problems with a loose strap.
Dave