My coachman vip 545 /4 causes no such problem behind the xc70 or the discovery.
Volvo I run 41psi all round and van 65psi.
Tyres are pirreli zero all season on the volvo.
How's your hitch? Worn friction pads can cause all sorts of unwanted movement. Did you clean the paint off the towball before use? As the paint will render the friction pads inoperable.
Apologies if Im teaching granny to suck eggs but while tyres can contribute to problems I don't see them being the whole problem, otherwise there would be far more problems.
Paul.
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