Modifications to your smoker?

So I've came to the conclusion that I need to change the casters on my Assassin 28. The ones that come standard are ok if your on concrete all the time and well lets face it we are not. So I'm looking to change them out for some Pneumatic ones. Anyone have suggestions on which ones to look at? If we messured the plate correctly its 4" wide and 3 1/3" long. Bolt holes from left to right on the bottom is 3 1/4" and bolt holes from top to bottom is 2 3/4"

smokeacholic said:

One bit if advice, if you install pneumatic tires be sure to carry means of airing the tires. That cooker is hard to move with a flat tire.

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I was looking at the foam filled ones as they suppose to limit flats