Pete, there are no "family" cars, including 4x4 varieties, such as Land Rover, FRontera, Kia etc which are heavy enough to legally tow the van you describe.
Whilst they may actually be able to move it, if you get stopped for a routine police check, you will be prosecuted, if you are involved in an accident, your insurance wil be invalidated.
The kind of size vehicle you are looking at tolegally tow this size van is something like the Mercedes Sprinter van.