First things first, you need to identify your van’s weight and braked tow weight limits. You can find this in the owner’s manual and they are usually detailed on a plate or sticker somewhere on the van itself. This might be on the body behind the driver’s door, on the back of the fuel filler cap or in the engine bay, for example. It should also be possible to find out a trailer’s weight from its owner’s manual or on the trailer itself. Don't confuse gross vehicle weight (GVW) with the gross train weight (GTW): The GVW is the maximum permitted weight of the vehicle (plus any load it is carrying), while the GTW is the maximum permitted weight of the vehicle plus any trailer being towed and its respective load. For best stability, the trailer and mini digger should weigh less than 85 per cent of the weight of the towing vehicle. You may also need to fit a tachograph if the gross weight – including the trailer – exceeds 3.5 tonnes: vans.honestjohn.co.uk/van-news/comment/do-you-need.../