- the cargo bay looks easy to shield / may already be well shielded
- there's a doorway between the cabin and bay
- used ones seem to have held up well
It'a hard to find that combination where I live (upper Midwest). Comfortable vehicles like conversion vans and RVs are hard to shield and usually have gasoline engines; easy-to-shield vehicles like box trucks and delivery vans tend to be in rough shape and aren't easy to convert into a living space.
It looks like it has a wooden floor.
Do not under-estimate what emfs will manage to enter from underneath.
The mobile phone call test didn' t work in a solid steel seacontainer, i guess because of the open bottom.
Most modern cars ( a van from 1998 is probably still not too bad ) are rather unbearable, you have to test-drive them over longer distances and feel your response.
Meters are not going to be of that much use ( in my opinion ) when these only register relatively weak signals, which may still be problematic.
Apart from shielding the floor, adhesive transparent shielding of the windows seems a good idea and would be easy to do with this chevrolet van with its flat windows.