Erm... You started towing it from the rear correct? That is known to cause very weird issues.
If you want to tow a vehicle in steelbeast, best, most safest way is that you reverse front of vehicle that you want to tow. Otherwise there can and it is known to be very weird graphical issues. I haven't yet heard that it would actually destroy a vehicle. That was new to me.
This is from most recent patch notes.
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Every (military) vehicle may now tow any other (military) vehicle – except helicopters.
They must however move closer to the target vehicle (no winch, just
fixed length cables), it takes longer to hitch (and disconnect) a target, and the
towing vehicle must be of the same or higher weight class.
At the moment
there are also unresolved issues connecting a target vehicle to the front of the
towing tank – it works … but it doesn’t look pretty.*****************
And good to know that you got it working
If you need any more help, just let us know and we should be able to help you out.