Malcolm,
Used to have one of these carriers on my bailey ranger a few years ago, they are ok, the holes are predrilled in Alko chassis, but you might have trouble getting the spare out if the punctured wheel is on the wrong side of the van. it`s not imposible you just have to jack the van up prior to removing the spare from underneath.
Be sure to leave the van hitched to the car whilst jacking and changing the wheel.
Tony A
Facebook
Twitter