I installed a set of Hankook tyres, RA08 for my company's Mercedes bus, MB140D and am quite happy with the feel. Cost wise, its rather cheap, at SGD125 each for 195/75/R16.
The steering feels lighter now (maybe the old stock tyres were .....old??) and well bus does not feel that "bumpy" now. I have always kept the bus in tip top condition, including pumping the correct air pressure for the tyres, etc, and the old tyres still feels sluggish.
Will post more once this set reaches 1000km. If more pple interested, will keep posting at 5000km, 10000km. As of today, it has done slightly above 200km.
Cheers....