A touring version has appeal for folks to get out and do serious cross country riding but the upfront investment for a company as young and small as Zero is a real gamble. To allow their current offerings the freedom of long cruising and fast DC charging they could farm out a trailer build to test the market. I'm part of the aging baby boomers, and we represent a very large population bubble with ready cash and plenty of time. My thoughts on the trailer is for it to carry batteries capable of the 300 mile range that Tesla has and be able to charge at Tesla's supercharger stations that are popping up all over the country. The battery bricks would be in a parallel configuration for riding and when plugged into a Supercharger, 100 amp rated contacts on relays would change the bricks to series for the voltage of the Supercharger. Since most all charge stations are pull in and back out, and we don't know if or when Zero will offer reverse, the trailer could be configured with a low power motor for backing up. I know, crazy idea, but it would give the motocross hierarchy of Zero's management an idea of how many of us want to travel the country on electric bikes without them having to invest in an unknown market.
On a very small and admiringly low buck amateur scale I did this about 13 years ago. Before there was Zero. I was into EVs and I used the same motor they started with 10 years ago on their first offering. It is called an Etek and was developed for Briggs and Stranton 15+ years ago when B&S entered the electric outboard market. Not a puny little Minnkota kind of trolling motor, but a serious PMDC motor. I hooked up with a group of gas minibike racers and it wasn't long before they changed their event to a 50 miler in Arizona on route 66. My little creation back then was fast but only had a range of 6 miles. My solution was to build a battery trailer and haul (6) 180 ahr flooded golf cart batteries to extend my range. To give you an idea of the strength of the Etek motor, it did just fine hauling a 110 lb scooter, a 220 lb rider and towing that 450 lb trailer for the 50 mile run plus I still had about 10 miles of range left.
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Used a golf cart charger.
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Here it is unencumbered by the trailer. You have to remember this is at least 2 years before the first Zero (it wasn't called that back then).