These trucks are simple cuts from 1.5 x 2" lumber and use 1.5" diameter Hobby Lobby wheels (19 wheels for $3.99). You can use a pine 2x4 if you like, but the photo shows a pickup and a van cut from 3/4" thick red oak that was ripped to 2" then glued to 1.5 x 2.
The pickup bed is a compound cut made from the piece that was cut out of the blank when cutting the cab and chassis.
Axles are 1/4" oak dowels. Drill the axle holes 9/32" before cutting the shape. I used Feed-n-wax on the axles before gluing the wheels on. They seem to roll very well - they beat a Hot Wheels car for roll distance on a ramp test. Not too scientific, but pretty fun.
