MOC designer Ingmar Spijkhoven
Posted: Mar 19, 2017
Both Models included in ”Trailer Tr4 MkII 8258 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.
This specific version of "Trailer Tr4 MkII” fits and works perfect with LEGO® Technic set 8258 Crane Truck. This LEGO® Technic set 8258 Crane Truck needs to be slightly modified. Free instructions on how to modify your set are available!
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.
A jeep or dolly is basically a simple chassis with a couple of axles and a fifth wheel. It is much like the rear end of a semi-truck. The booster is located at the rear end of the lowboy. It has a pivot point to make the axles follow the trailer easily. The purpose of both is to spread load over more axles, this way the weight per axle is suppressed.
As one of the designer's trademarks this truck model is provided with full solid axle suspension on all axles, so including the front steered axle. Regular LEGO® Technic shock absorbers proved too large. Instead Rubber Belts are used, to achieve this the movement is converted using a lever constructions.
You can build it yourself! To do so you can buy the Building Instructions. Early in the building process you will see what it is that you are building. You will be very excited from the moment you start the build of "Trailer Tr4 MkII 8258 Add1" till you finish it with a total number of about 1150 pieces.
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MOC by Ingmar Spijkhoven