3 wheeled trucks or cars too for that matter are just a little strange to most folks. however, 3 wheeled vehicles have been in use for quite some time. more so in Europe and Asia than here in the USA. first in line is an old English Scammel. i am not really familiar with these Scammels but this is either a "Mechanical Horse" or a "Scarab". next is a picture of two German trucks. i know the green one to be a Goliath and i think the other is a Loyd. third is a Japanese Kia. next a Japanese Mitsubishi and last a Mazda DA.