suse1023- remember most of the HTD guys over on the other forum have tried the MTD route and report as you have noticed ,they ride very rough,and cost more.My truck and almost all HTD's are ment to be driven for days and have air ride front axles and air ride cabs.MTD's come from the daily delivery trade - drivers go home for the night,so they have very little in the way of amenities re sound insulation and other comforts.The wife and I can talk in a normal tone of voice,the floor is 3" thick and the doors are double sealed.
The transmission is 'automated' that is to say no clutch peddle so the wife drives it .