Atberger,
I did the same as you, I replaced only 2 of the bases and it made it better but not to my standards. Then I was told to replace them all including the legs at the same time. I did and now it is a world of difference. Just like brand new.
I guess all the stress of traveling in a house on wheels shakes every piece loose. If you only change one, the other pieces are still loose.
I ordered my table legs and accessories from:
http://www.dyersonline.com/
Glad could be of little assistance.
Shoot pics of the ride.