Each vehicle will have a recommenced minimum crossbar length listed in our fit guide this is the shortest bar that should be used. Need a little more room? Sizing up one bar size is fine, we do not recommend going beyond this.
This link provides estimates on the number and combinations of accessories that will fit on a given crossbar. Actual capacity will vary depending on the types of gear carried and the vehicle itself
If you need additional help please contact our support team here, or by phone at 888-925-4621 during business hours