FWIW: I started our recent 2-week Utah trip with a brand new 8.5' XTend telescoping ladder. By the middle of the trip the Utah red dirt/dust had infiltrated (it infiltrates everything

) each of the lower sections to the point it was difficult to collapse.
Once I got home I tried flushing it with water, high psi air, lubed, etc. to no real avail or solution.
They, since they do not include a limitation on the type of use its designed, sent me another brand new version of same at no-charge under the warranty. But when grit gets in between the two sliding tube surfaces it will become a problem...again.
Other than that problem, which is a significant problem when using it in wind blown grit environs, the XTend is a HUGE improvement over the ladder that comes with the Autohome RTTs (and other brands).
Dan