Cliff, I just realized you might be needing to replace your tires and are looking for the smoothest riding one. Your tire size is 225/55R19 and your wheels are 19x7. I would go up one size to 235/55R19 tire. This will give you a slightly taller sidewall (1/4") and the load rating will be 105 so you can run the tire pressure between 35-37. In that size, there are two tires that are the most comfortable that I know of and those are the Pirelli Scorpion AS Plus 3 and the Vredestein Quatrac Pro +.
Both are grand touring all season tires. The Pirelli being a "Plus 3" are specifically made to be smooth and quiet for the American market. Many members here run these tires and really like them. The Vredestein is a unique grand touring all season in that it also has the 3 peak snow rating so it is much more capable in the snow than the Pirelli but it also has a slightly lower tread wear rating. They are both very similar for comfort and at the top of the list. Another recommendation would be the Michelin CrossClimate 2 but for me comes in third for comfort. It is similar to the Vredestein in that it is a grand touring tire with a 3 peak snow rating. They are probably the best grand touring tire in the snow but they are definitely a little noisier and not quite as smooth riding because of their unconventional tread pattern.
If comfort is your top priority, stick with the Pirelli. If snow/winter traction is a high priority, go with the Michelin. The Vredestein is right in the middle. Has the comfort of the Pirelli with much better snow/winter traction but not as good as the Michelin.
