5x8 WILL do 2 bikes but as stated, tight.
6X10 will do it MUCH easier and have plenty of room for spares etc.
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CBR Bob
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Rider Ed. of N.J. Inc. Senior RiderCoach and Site Coordinator @CCM & RVCC RiderEd of NJ Inc.
BowlerBrian has the coolest open 3 bike trailer... its a jetski trailer thats been converted for bikes and I used it at least once, and its really sweet. closed trailers are nice, but i definately noticed the additional wind resistance pulling johns.