Thanks for the compliment - not many people seem to like her but we do! 8)
I'll try and help if I can but I'm no techie!
My bus is lowered (but I'm not sure by how much - I'll find out and get back to you) and the tyres are 205/40ZR17 34W s all round and they're fine with the load.
To be honest they can be a bit harsh but not too bad, it's only really noticeable if you hit a big bump or pothole - a Modern Mini Cooper with 18s is similar if that helps at all!
If you need anything else just let me know - I'll try my best to help!