Please consider signing this Petition. Although I am not convinced that Petitions to Parliament are often successful, this may be worth an attempt.
Petition: Increase the Category B driving license weight limit from 3,500kg to 3,650kg
Many modern motorhome chassis are capable of a maximum authorised mass of over 3,500kg. We believe existing weight limits for Category B licences are impractical, and many vehicles end up being overladen. Give everyone an extra 150kg.
petition.parliament.uk