usually accompanied by PA state police, which have full authority to enforce laws regarding weights and road worthiness of all vehicles, privet and commercial.
FHWA... Questions and Answers about Vehicle Size and Weight snipped from FHWA webpage
23 CFR 658.5 Definitions
Q.. What are recreational vehicles?
They are generally a vehicular-type unit primarily designed as temporary living quarters for recreational, camping, travel, or seasonal use that either has its own motive power or is mounted on, or towed by, another vehicle. (From ANSI)
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Q.. Are recreational vehicles subject to Federal size and reasonable access requirements?
No, because they are not commercial motor vehicles.
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Q.. Are recreational vehicles subject to Interstate axle weight limits?
Yes.
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Q.. Are recreational vehicles required to stop at State scale sites?
Each State may set its own requirements.