I hope you keep a close eye on the trailer attachment point on the rear rack and tighten it as needed.
The attachment to the rear dropout would be a bit stronger.
That's good advice, thank you. I have been paying attention to the attachment points. I've checked all the nuts and bolts on the bike and trailer and did so closely after the spill. All seems good so far. I actually ordered a torque wrench this morning, it can't hurt to have one. Plus, I've ordered a front rack and a mudguard and they each specify NM tightness for installation.
I considered the Burley dog trailer which uses the rear dropout and my favorite bike shop even carriers them, but the size I need is unavailable.
The trailer I have, Dutch Dog Design, does sell the side tow arm if I ever need to make a change.
Most definitely... or the seat post.
The company that makes the trailer, Dutch Dog Design, does offer a seat post mount with a rack as an option, but it wouldn't work on the Samurai.
In addition to the size for my dog, the center tow arm was my main goal. It seems more secure to me. I'm finding that there isn't much resistance while moving. The only time I even notice the trailer is when my dog moves to change position. I have some strong velcro straps that I've been bringing along in case I need to secure the rack to the seat post, but on my outings so far, all has been good.