Got a 2009 eZip Trailz LS (Low Step).
Turned it into my "Comfort Cruiser".
Added my "homemade" 25.9V 31.2Ah Li-ion battery pack.
Regeared from a 20T to a 16T motor side wheel sprocket.
This moved it up to a near 20mph cruising speed.
2.125" comfort Whitewalls
Big comfy seat
Economy test run provided almost 50 miles at 16mph ... motor only!