Make sure that whatever trailer you use prioritizes comfort for a dog and can also handle a dog standing up and moving around to get comfortable again without risking tipping over. Not something that would be an issue with small children that can be strapped sitting down but there is no real good way to do the same for a dog.
Might be a good idea to look for a trailer that is built more like a wagon and has wheels in the back and front of it for extra stability when your dog ends up moving. Something where it sits the same way whether your board is connected or not.
I don’t think the version used for kids would be an issue if you trained your dog to get it in and not move at all. A smaller dog could get away with moving around without issues but the size of your dog is what could cause a problem. Plus if you get one that is more stable when standing alone, it will likely feel more secure to your dog.
Apex ESC cases make it easy. Just get a flat aluminum L piece, put holes in it and screw it in with the ESC bolts on top of the ESC case. Then attach the burley piece on the L piece and boom. If that makes sense haha. Best pics I have.
@rafaelinmissouri has a more sturdy way of doing it, but this was easier and held up fine.
That trailer is only rated for 75 pounds/ 34 kg, but their dog weighs 100 pounds. I’ve not seen any dog specific trailers made for extra large dogs as is the case with a lot of dog products for transportation.
With how large your dog is, it will likely be best if you can make one yourself, or get a cheap but trashed existing trailer and modify it to work better for your dog. Although if you can’t weld and don’t know someone who does know how to that can help you then it might be cheaper to try and buy one from outside of Australia and ship it in.
I’m guessing that it is expensive to hire a welder in Australia like it is in the US. If it is cheap there then hire someone to help and avoid the shipping costs