I also only noticed during building the sets LDraw files.
Bricklink lists the alternative variant for example.
The differences are on the trailer:
- truck / trailer hinge raised/reinforced
- rear axle raised and stabilized with a plate
- upper tiltable platform hinges doubled and platform reinforced by using a plate instead of a thin bar
Raising the trailer gives a higher center of gravity, so more easy to tip over, but during play the pin could slip out too easily. Rear axle in first variant was two rows of 1x4, which could fall off when driving over obstacles and the upper platform could collapse due to too thin transverse bar and only one row of hinges per side.
First variant looks a little better, but in practice it had drawbacks during play.
Bricklink lists the alternative variant for example.
The differences are on the trailer:
- truck / trailer hinge raised/reinforced
- rear axle raised and stabilized with a plate
- upper tiltable platform hinges doubled and platform reinforced by using a plate instead of a thin bar
Raising the trailer gives a higher center of gravity, so more easy to tip over, but during play the pin could slip out too easily. Rear axle in first variant was two rows of 1x4, which could fall off when driving over obstacles and the upper platform could collapse due to too thin transverse bar and only one row of hinges per side.
First variant looks a little better, but in practice it had drawbacks during play.