An RV friend of mine wrote directly to Maryland State Police for a direct reply to this issue.
Date: Fri, Jun 3, 2016 at 3:48 PM
Subject: Weigh station question
Hi, thanks for your service.
I have a question regarding who is required to stop at the weigh stations. My belief is that it is for commercial vehicles only. However, the signs now say all vehicles over 5T, and there is a rumor floating around the recreational vehicle community that any RV over 5T must also go through the scales. This, of course, would be a very large number of Class A motorhomes and a fair amount of 5th wheelers.
Could set the record straight please.
On Mon, Jun 6, 2016 at 2:32 PM, MSP CVED -State Police- <email@example.com> wrote:
From: Kyle Donaldson -State Police- [mailto:firstname.lastname@example.org]
Sent: Tuesday, June 7, 2016 9:17 AM
Subject: Re: Weigh station question
Good Morning Mr X;
Thank you for reaching out to the Maryland State Police to have this cleared of any misunderstanding. Under the Federal Motor Carrier Safety Administration rules and regulations all Commercial Motor Vehicles (CMV) over 5T GVWR would be required to enter the scale house. Maryland legislation has adopted these rules and regulations which can be found under Title 25 section 111. Signage along the highway systems marking the scale facilities as open and directing those vehicles in for random inspections is regulated by the Maryland State Highway Administration. I can not elaborate on this area further as the signs have been posted in accordance to those regulations. It is safe to say here in Maryland no RV's or vehicles even when over the 5T GVWR would have to enter the facility unless engaged in commercial enterprises.
Feel free to forward this email to those who wish to have it for their records.
Travel safe, camp free and enjoy the company of family and friends
Corporal Kyle Donaldson #5015
Duty Officer / Cadet Fitness Coordinator
Commercial Vehicle Enforcement Division
6855 Deerpath Road, Ste. G
Elkridge, MD 21075