The only thing on the Zero that doesn't require attention that does on an ICE bike is the Engine.
Even there, the motor, BMS, charger etc. should be verified as operating properly
Other than that, it is the same as any other motorcycle. You have to make sure that the all bearings
are seated properly, front end and swing arm. Belt is tight. All bolts and screws are at proper torque.
Brake fluid is correct, lights etc.
It states in the owner's manual that it should be serviced at initial 600 miles and at least every 12 months.
Manual also stated that failure to update firmware could be grounds for voiding your warranty.
They do mention over the air firmware updates in this press release, but, I don't see it in the manual
http://www.zeromotorcycles.com/press-releases/oct-17-2017-2018-model-line.phpManufacturers announce things all the time that don't make it to the end user.
As far as not being able to take it to the dealer because you have a VW Gold,
I have towed my motorcycles allover the country using my Honda Civic Hybrid.
I can't imagine that your Golf is any more anemic than my Civic. I didn't notice
where you are in the world but I can't imagine that there isn't power between
you and the dealership. Here is a link for a hitch for the VW Golf for well under $100
https://www.homedepot.com/p/CURT-Class-1-Trailer-Hitch-for-Volkswagen-Golf-11654/205630661?cm_mmc=Shopping|THD|google|&mid=stzcD2aLN|dc_mtid_8903tb925190_pcrid_195274179091_pkw__pmt__product_205630661_slid_&gclid=CjwKCAiAsejRBRB3EiwAZft7sJhVhNgjEAymtA3hYAMa0W4s_2_jK5lj00V09rLHtgDrZQjveqeJ6BoCEeEQAvD_BwE
If you don't wish to get a hitch and buy / rent a trailer, Take a day or two and
ride it. I rode my stock 13KW 2016 SR from Hollywood Electrics to Vegas ( just under 300 miles ).
It took longer than it would have if I was driving a conventional vehicle but with planning
I made it without ever running out of juice.
Quit whining and ride