I am not familiar with the 2006 2551 bed drawers. But I can say with confidence, places like Menards and Home Depot sell those high quality ball bearing roller glides for drawers. Maybe you can swap the cheap drawer rollers with those high quality ones. At Menards, I recall them being real cheap, like $10-$12 a pair, with little price variation pending length.
BTW: We got back from a 3 week trip in the Canadian Rockies about 5 weeks ago. What a place to visit!SEE PICTURES BY CLICKING HERE