I am eyeballing a van that's already been well converted, but I have an 8 year old kiddo, & the conversion does not include a formal rear seat. It has a long bench box sofa extending from behind the driver's seat to the back door. The seller has insulated & floored, but I imagine I will need to bolt the bench & belt harness somehow. 
Does anyone have experience with this issue?
Thanks so much!
Does anyone have experience with this issue?Thanks so much!