Back seats

[Vannin]

Hi all this will be my first post but I have done a ton of reading these last few days!
I'm yet to buy a van but I'm doing research now while I have time.
What I want to do is add a rear 3 seat bench to the back of a CFS that can be mounted far enough back in the van that when it folds down a bed base can be put over the top.
I have found some info mainly the lack of seat belt anchor points for lap sash style belts so I'm thinking of a seat with built in lap sash belts.
The wreckers here can be a little funny about walking the yards so I was hoping someone has suggestions on a seat with inbuilt belts that the back rest folds flat on the base that comes standard in a mini van from new.

Hopefully the reference pics attach.
If it helps for reference I'm coming from VW back ground where the seat folds backwards to form the bed I'm thinking fold forward and slide a bed board over it.

Thanks for reading