I have been using my ordinary motorbike trailer, and towing boats, for decades, and like to think I am competent in e.g. reversing them. However I want to take a motorbike with me for future trips without worrying about extra ferry/tunnel/toll charges, so for me a rack on the back of my Ducato panel van seems the best solution. Which is why I bought the lightweight trail bike, to add to my other two big heavy fast ones, BMW 1100 GS and K series). I am quite happy loading using a ramp, even single handed if necessary, it's no different than what I am used to with the trailer.
With the standard trailer I carry a spare wheel, and a sometimes even a spare hub/bearing unit, since I have one anyway for my boat trailers which are regularly submerged in salt water, and bearing failure with those is always a possibility no matter how carefully you look after them. They all use the same hub, fortunately.
I don't expect the wheel bearings on the bike trailer to fail anytime soon, but its wheels do spin around nearly twice as fast as my road wheels, as do the tyres etc. so I do stick to the speed limits for them.
The boat trailers are lightly used, mostly only a few times a year and don't see thousands of miles. Unlike a bike trailer in regular use behind a camper on long trips.
I could fix my trailer myself, or any local garage could, but would that be the case with something like a hydratrail particularly when you are far far away in foreign parts, and it's something more fundamental than just a tyre or wheel bearing that's needed ? What are you going to do, who are you going to call, where are you going to leave the bike securely ? If you can't get it fixed, how are you going to get the bike home, I doubt a breakdown policy would cover that.
That is why I favour putting a rack on the back of mine, where the bike will also get the same comfortable ride as those of us inside, no worries about speed, extra charges, constantly looking to see that the trailer hasn't developed a fault etc. But the compromise is that I am limited as to the weight of the bike, which also adds to the payload. That's ok in my setup, and the bike is great fun.
If I want to take a big bike it will go on the trailer as usual.
Currently favouring
http://www.armitagetrailers.com/scooterrackpage.htm? who seem to know their stuff