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Licence offences are based only on plated weights. If I have a vehicle plated at 3500 kg MAM (or a vehicle & trailer with a combined plated MAM of 3500 kg) and overload by 200kg I will not have committed any licence offence whatsoever insofar as I am driving a vehicle that I am explicitly permitted to drive by my category B licence entitlement.
Weight offences on the other hand are based only on actual weights (Actual Weight Minus GVW or GTW) so in the above (extreme) overload scenario I will have committed a (fairly serious) weight offence.
Not sure how insurance is invalidated though. .. driving outside of licence entitlement perhaps but for weight offences, driving without insurance would be a definite charge sheet add-on if it was the case.
i think licence wise the limit is 3500 not 3499.
the problem comes with actual weights. if you go over not only will you have the overweight issue to deal but licence offences and invalidating your insurance.
If you search online there is a guide called the vosa guide to weighing that covers how weighing is to be conducted and the tolerances.
if you are going to run that close to your limits i would get car will full fluids weighed, same with tbe van and then work out how much payload you have for gear.
I would hate to use the "Suck it and see" mirrors because even when towing. 90% of the time I use the car mirrors to see what is in the next lane, reserving the extended mirrors for when I want to see directly behind
If your tug is exactly 3500Kg then you have a problem.
1. Most weighbridges have a tolerance of at least +/-20Kg and in some cases +/-50Kg so you could be well over.
2. VOSA usually use the drive-over plate thingies when they are doing temporary stops at motorway services etc - they are typically +/-50Kg.
Not too much of a problem if you are a car/SUV/van towing a caravan as you can shift some items into the tug until you are under limit, but you can't do that with a motorhome.
I had a Winterhoff on a 2007 Elddis (the only decent thing on the caravan) and it was a lot easier to use than the many Alko’s I’ve had before & after.
What model BMW is it? I have a 5 series with a factory retractable towbar & there’s plenty of clearance