You`re using the standard BOB skewer and fork?

Yes, the larger fork though for use with 29" wheels. The problem with the retro fit was in the rear fork. Because the scooter rear tire is a couple of sizes bigger than a standard one I have to run the axle pretty far back in the dropouts. They are nutted with aggressive nuts but I still safety wire the axle to the brazeon on the end of the fork so it won't spit out under load. Which did happen once, but not again.

If so, is the electrical part easilly moveable between different bikes

The only control I have on my bars related to the engine is a plastic thumb throttle with a button on it. I have a couple of connectors at the rear dropout that hook to the trailer and can do the whole operation under a minute, even if the trailer is loaded. At this time I only have the one bike set up but for another the easiest way until a decent clam shell throttle becomes available is to have one of the cheap plastic ones just mounted on there. Really doesn't get in the way of operating the bike and weighs very little. Wireless would be the way to go but that is the next level. There will be an ap for that.

Also, do you think the suspension on the Ibex is necessary for relatively smooth surfaces?

I am glad you said relative, because the variety of surfaces that you will see in a days riding varies so much around here that I feel that suspension is probably a must. You know how well a Yak starts to handle going downhill in baby heads, when they start to bounce around strange things can happen. Well just think of that smooth surface as only the connector for pot holes, storm drains and manhole covers. Because of the motor assist all weight penalties within reason are compensated for and then some. The one caveat here hinges on forthcoming trials using a larger diameter wheel with a different hitch.
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The Yak suspension is inactive while the motor is going as it is just a simple lever type suspension with a cheap shock on it. It does keep the hop to a minimum I believe but I can hear it back there banging around in the real rough stuff, but it handles well for all that.

For someone that already has the bike(s) they like and just would like to add a little zoom zoom to their lives a moto trailer makes good sense. You will be seeing more on this in the future for sure!