Yup - it is very sad. As you say for all involved. And yes about resolving road rage and/or contact.
Hadn't caught up with reports the older man was the aggressor - however I have seen that once in person and a couple of times on video (older guys, generally not in top shape, having a go at younger persons).
Though that potentially makes more sense as, unless you were an idiot and/or drunk, etc., if you were leaving permanently and getting married within the week - why would pick a fight on the 'side' (actually center shoulder/split) of the motorway? Instead of being like 'oh well, in a week the chances he will ever do that to me again are very small - so whatever'.
Yeah - I hope the truck driver is able to cope with it in time.