DMan
shawly the least hangeriest guy on rotorburn
If you rub the tyre circumference with the palm of your hand and feel corrugations, sharp tread lips or a large whoop there's a good chance that a lot of the noise will be the tyres. Another thing that's annoying in a van is bad wheel bearings, as they seem to resonate a droning hum at over 80km/h and especially in the rear. Exhaust mounts broken is another one.
All excellent info. I have check that out. I do think better tyres will help.