High speed driving not a problem
We've had our Thor Venetian up to about 80 MPH (peak at bottom of hills) on I-40 a few places in the California through New Mexico stretch. No issues with the structure, so I don't think air pressure against the front is an issue at normal (60-70 MPH) highway speeds. The Freightliner chassis appears to be solid, and we haven't noticed any movement or shifting of the structure that's been built on it. Ours is a diesel pusher, so the chassis has a lot of heft (and a step up in the floor) in the rear which might help with that.
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