I have seen several threads on tie-downs over the years. You are tying the bike down for a "Worst case" scenario, not a smooth ride to grandma's. Someone above mentioned that no matter how strong the tie down is it is no stronger that what it is bolted to and that is what you need to consider. If you bolt a single tie down like the one shown above, then ALL the bike weight becomes focused on that spot when the trailer hits the guard rail, or turns over (and this does happen). The weight of the bike WILL tear any motorcycle size trailer frame crossmember in half easily. You need multi mounting points to distribute the weight evenly thru out the floor / frame of the trailer. I see folks talk about not compressing the forks when you tie them down, leave the forks loose then hit a large pothole and when the bike (or car) bounces slack comes in the tie down, the hook comes free and you load is now loose and moving around, and that is not good. I have heard the Condor sales people at bike events say to use two tie-downs pulled forward with the Condor and you are good to go, if the trailer tips, the bike WILL fall out of the chock. They are very uninformed sales people spewing crap. I asked on of them what about that setup when the trailer slams a guardrail, he said and I quote "How often does that happen". Guess never in his world.
Look at the big picture here, use at LEAST four to spread the weight around, six is better evenly spaced, with at least four pulling forward into the chock. I have e-track in my trailer and a condor. With wife helping we can load, tie down and be locking the trailer door/ramp in five minutes and we use 6 tie-downs.
I feel sure I can turn my trailer at least on its side and the bike remain secure. Just my opinion.