This is a very special FREE plan that enables you to expand Plan #235 Crane with a purpose-built undercarraige unit.
This will transform your old-timer styled crane unit, which is truck-mounted into a totally new mobile crane vehicle. First you just need to buy plan# 230 and #235 and build the actual truck/crane units. After that you can expand it with this bonus plan.
PLEASE NOTE: You must already have bought the plan #230 (Tow Truck) and #235 (Crane).