I could see the extension flexing vertically (yes there was slop too). Would you not feel it chucking when driving on uneven payment with excessive much slop? I don't think his hitch weight was that heavy, yet it caused visible deflection in the extension - I cannot image what it would have looked like with my trailer back there.
I was passed at about 75-80 mph while going 60 mph the first time, but passed him midway on the I-5 southbound climb near the Camino Island exit (it goes to four lanes southbound) still doing my 60 and that's when I actually got to see the setup flexing before he cranked up his speed again on the flats. I didn't see him after that, but we turned on to US 2 eastbound...