Differences in air pressure is causing the aluminum siding to pull away from the lauan panel. So traveling at higher speeds certainly makes the problem worse. It is also possible that CR did a poor job of stapling the siding in the first place, unfortunately you won't know til the work is in progress and CR will probably still deny warranty coverage.
The quote from your dealer is probably realistic, there is a lot of labor involved. It is possible to make the repairs yourself, removing all of the edge trim, windows, doors and other wall penetrations, then removing one section of siding at a time. Re-install using plenty of staples and angle them, up, down or sideways to minimize the tendency to pull out. Or use small, short wood screws.
A cheap and maybe tacky alternative is to add some extra 'penetrations' at strategic places to compensate for the failed staples, a flag pole mount, an outdoor speaker, basically something screwed thru the aluminum siding, lauan panel and into the studs, must be well caulked.
Texas Baptist Men-Retiree Builders member since '01
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