I had a similar concern with my towbar about 5 years ago and was able to seek advice from a Thule towbar dealer in Lincoln.
He advised that the play was within tolerance and was OK to use.
I have since upgraded the van to a 2000kg Swift Elegance Grande, with no problems with the towbar and the play has not increased significantly.
If it locks in solidly then you should not have a problem.
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XC60 2013 D5 215 SE Lux Nav geartronic
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