I began ,in 1992, visiting my sons in Colorado with my father's recreational vehicle rig. This meant stopping in the truck area of rest stops on the interstate or the large fuelling stops with commercial plazas for truck parking. When we travel to Florida for winter we'll again meet all the trucks. I like to look at the tires which now are almost all 11.00:22.5 which was once only used on trailers. The van trailers are now 53 feet which is 3 feet longer than the maximum length allowed overall in Michigan when I grew up. The tires are almost all radials. They have unibodies with stub frames under the trailer at the tandem axles and the fifth wheel only. Almost all have internal bracing which is less efficient cubewise and more aerodynamic for fuel mileage. The tractors almost all have tandem axles which avoid the slipped disks of drivers so common with high GVW and single axles. The front axles are still solid beams with king pins. Most have suspended seats like unsprung agricultural tractors with shock absorbers and also cab isolation from the frame for driver comfort. The engine is diesel almost exclusively with a turbocharger. Inlines are more common than vee type. They have chrome plating on the stacks and the air cleaner cannisters which are signal on the type. The look is not so different from automobiles of the 20's or 30's but much larger. They still have mostly manual shifted multispeed transmissions with auxilliaries to split the gears. Satellite radios and GPS have replaced CB and noisy commercial radio channels. To slow down they have Jacobs brakes to provide engine compression release to avoid runaways with the continuous wide open throttle of a diesel engine. Diesels accelerate by adding more fuel injected to a pre-chamber in heavy duty connected to the main combustion chamber. This is Poser 7 PRO. Notice how the dual rear wheels are cupped in like concave mathematics and not the convex dished out of the front wheels. How does the OS convex core accomodate this? Is it through grouping and inverting maps? I have been studying this since 1994 when I made my first 3D models. Notable failures occur when importing/exporting if this is not considered in construction of the model in it's native application. They can rip and they can webover as they try to make a database fitting the client/server model. Parts and assemblies can get moved or scaled uncommanded.