I have recently completed my first truck. Searching eBay I came across a job lot of 3d printed trailers at a very reasonable price. One was a low loader. It has 4 axles at the rear with the suspension much like the Tamiya trailers in that each axle is paired with another via an inverted leaf spring. When loaded the weight distribution is such that the rearmost wheels are almost off the ground. I assume that what is needed is to increase the spring load on the front pair of axles but have no idea where to start with doing so. Or would oil dampers help? All suggestions welcome.