Both models included in ”Trailer Tr4 MkII Add1”, the jeep and the booster, are build with LEGO® in scale 1:17,5 and have simple LEGO® Power Functions. It is not build after a specific brand or type of trailer. This build represents both a two axle jeep and a two axle booster.
The trailers features: solid axle suspension on all axles, one set of lights, the jeep has both a kingpin and fully functional fifth wheel and both have manually operated landing gears.
Different states, different regulations! Depending on the combinations overall weight, so the total weight of the truck, the trailer and the load, more axles might be required. Adding axles however is not that easy, it's not that you go to your local dealership and ask them to add an extra axle to your truck and trailer.