"To those who believe the Harvester is too small, I am pretty sure this model is based on a silage harvester. A silage Harvester can be transported as the design show however, combine harvesters are bigger and less likely to be transported on a trailer, thus the ratio of silage harvester vs truck are in ratio.
Also for those not familiar to silage harvesters, they chop up the crop and a truck usually drives beside the harvester in real time. If you search on the internet you would find the similarity in the lego design here.
Great product, wish lego can make more farming theme based products on a regular basis."