I personally do not care a lot what a truck has IRL. It has to fit in the game somehow. And it should not kick the physics - what a saddle behind the rear axle typically does. Thats a guarantee for a jack-knife accident with the first harsh braking or severe load pushing you downhill.
See as C70 example:
... the DAN is the same.
The 2070A with saddle low for example has such a frame collision issue with the trailer as soon as you have severe pitch angles as its 5th wheel sits correctly, but there is a lot of frame left. And for the sake of gameplay - a truck being allowed to have flatbed plus crane plus trailer should have the low saddle removed. And in case of the 5070 - remove the trailer option as soon as you use crane plus flatbed. The remaining space for a trailer and its constant collision in any turn is a joke.
Edit: If you think, a Paystar 5070 needs to have a crane plus more than 2 cargos - take the saddle low and look at Poghrims Trailer pack with a 3 or 4 Slot semi. VERY usable and not too long. Nice compromize. Better than having two nearly identical 5 slot semis. I am only missing a 6 slot gooseneck offroad heavy and a 4 slot gooseneck OFFROAD for lighter loads.