I noticed the PLS system rests on the the holders of the axle on the real trucks:
If you cut the rear supports of the PLS guide and place it on the rear axle support you respect the distance between the wheels and everything fits perfectly, I made the support like this for both A4 and M1074/5A1 versions:
For M1074/5’s the distance between the 2nd axle and the 3rd is 98mm.
For the M977, M978, M1120 and M1977 its 109mm.