I've got that cabinet (after Smokin showed it to us) and had a friend make me a new wood top out of maple. I soaked the maple top in Cedarshield wood preservative:
Cedarshield Cedershield turns the wood into a water proof material. The wood actually becomes like petrified wood after a period of time. I called the company and talked to them to find out if I can drill holes in it (to attach the smoker) and was told for the first few months then the wood would become impervious to water and cutting.
It's a one time, permanent water proof treatment for wood. I must disclose that I've dripped a couple grease spots on it that doesn't seem to want to come out. Doesn't bother me, but if I used the original top for a few months and let the treated top set up, it would probably be indestructible.
I use the cabinet just like you describe. Great storage. Solid. Large wheels. Low center of gravity. Easily rolls.