We just upgraded to a 4 seater, but ours has the option that the back seats fold up as well as the extension for the rear facing passengers feet. This design is only 4 inches longer than the standard 2 seater version. We purchased a 2017 Yamaha quite-tech and we love it.
The length was a concern for storage in the garage as well as space required in perpendicular parking along a street. Many 4 seaters with permanently mounted seats tend to stick out into the driving lane and present a hazard to the automotive traffic.
hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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