Changing vehicle model from dual track to single track - error

I have this Simulink model which models the lateral forces and wheel slips (it's based on the Lateral Control Tutorial model). The model itself models a 3-axle tractor which is linked to a 3-axle trailer. Both of them are currently dual-track and this has worked well. However, since the wheels act independently, I am looking to make both of these single-track.

The issue is, when I make both vehicle blocks single-track (keeping them 3 axles), I come up with this error:

"Simulink cannot determine sizes and/or types of the outputs for block 'LateralControlTutorial_modified/Vehicle and Environment/Tractor-trailer model/Three-Axle Tractor/Vehicle Body/Vehicle Body 3DOF Three Axles/vehicle model' due to errors in the block body, or limitations of the underlying analysis. The errors might be inaccurate. Fix the indicated errors, or explicitly specify sizes and/or types for all block outputs."

Which suggests the error is within the block (Vehicle Body 3DOF Three Axles) itself. But checking the "vehicle model" code gets me a function that I can't go into any further. Here's the 'error within the error':

Dimensions of arrays being concatenated are not consistent. Function 'Vehicle Body 3DOF Three Axles/vehicle model' (#643.326.570), line 5, column 7: "[yOut,FBody,MBody,FOut,FTire,Fg,wheelInfo,stateDer,status]=automlvehdynbicycle3a"

I was wondering: what kind of changes should I look out for when converting from dual-track to single-track blocks? I know that there will only be three sets of forces, displays, and velocities based on the number of 'wheels' being modelled (instead of 6 for dual-track), but what else?

[Amritz Ansara]

I.e. I do not know which arrays that are being concatenated are not consistent, knowing this will help even if only a bit!

[Amritz Ansara]

I found the Simulink annotations tab really helped me.