The real answer is that Morgans are very simple cars, the Three Wheelers are even more simple, I haven't looked at he service schedule, but I would be surprised if it was much more than an oil and filter change and give the whole car a spanner check to make sure nothing is loose,because of the vibration. The rear belt may need tightening, which a good Harley dealer is used to doing, and I expect the bevel box may need a bit more oil, which can be done from under the car easily, [if a bit messily].
Any decent workshop will be able to do it, and if you have an invoice detailing what they have done, I very much doubt it will really make any difference to re-sale values.
