One of the reasons is cost of:
In rural America - small towns can't always afford the start up capitol it takes to get a recycling program off the ground.
The easier it is to recycle - the more apt people are to do it.
Curb -side recycling and community trailers make recycling easier.
Why not re-use a vehicle that we once trusted to take our children to school - to now recover our cans, plastics and paper.
Step 1: An oversimplified recipe
Reinforce frame on passenger side
Cut 3 bays on the passenger side
Create some kind of dividing walls to separate - plastics - metal - paper
Convert side wall to swinging doors
Paint recycle green - add logo
Pick up cans - plastic - paper
Your design depends on your vehicle and your needs.