The company my mom works for (Arnold transportation, now owned by US Xpress) has bought several trailers with the super singles, and have been converting trucks over. Her truck hasn't been converted, and I don't think it will for a while due to the job she has, but she isn't looking forward to them.
She doesn't have much to worry about though, as she only drives about a 5-10 mile radius, never over 40 mph, taking beer bottles from a warehouse over to Miller Brewery in Fort Worth.
As for me, I am not really concerned about them. Supposedly, the ride is much better, and as long as companies/drivers check the tires properly, there should be little problem with them.