Are your wheels staggered? If not, then swap front to back temporarily, not forgetting to adjust the tyre pressures to suit.
Too high a tyre pressure, particularly in the fronts will cause wandering.
Tramlining, as I'm sure you know will happen suddenly - it won't be vague.
Any MOT garage will check your suspension bushes for you relatively cheaply - don't expect a $tealer to have checked anything that wasn't specifically written down.
At that mileage I wouldn't expect there to be much play in the steering rack, but the aforementioned MOT place can easily check that too.
A competent MOT tester will be able to check the bushes and rack for excess play in about 15 minutes, once it's over the pit.
IMHO buckled rims won't cause wandering or vagueness in the steering.
Mike
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