I think most of the normal van type insurance is 'carriage of own goods' - if you want cover for moving other peoples stuff your into Haulage policy's.
There are three common types:
“Carriage of own goods” insurance is appropriate for trades people such as builders, plumbers, electricians, window cleaners and so on where the van’s contents belong to the owner and are being used for the work being carried out. The van’s contents will be tools and materials typically.
Haulage insurance is for people using their vans typically for a single drop load carried over a long distance. You will be carrying the goods on behalf of a third party who will be paying you specifically for this. Your insurance certificate will include a phrase saying that you are allowed to use the vehicle “for business purposes including the carriage of goods for hire or reward”. A couple of drops would be acceptable, but having several drops in a small area is regarded by insurance companies as a higher risk which will require courier insurance.
Courier insurance is similar to haulage, in that you are carrying other people’s goods for hire or reward, but it is expected that you will be using your van in a small area in a town or city to make many drops. You might be carrying parcels to local businesses or homes for instance.
The goods and tools being carried are typically not covered by the insurance. You need to take out a “goods in transit” insurance separately to cover the goods. Tradesmen can sometimes get tools cover as an optional extra on their public liability insurance.
If you allow your vehicle to be driven by someone else, or used for some other purpose, it will not be insured and in fact it will be being driven illegally.