I only have 1/4" of room between my bed and inner side of my tires? Is that enough?

[Hazieview]

I just bought some really wide tires for my back wheels. They fit so tite that I only have about 1/4" inch of room between the bed and my inner back tire.

Is that enough room to safely drive the truck? Should I put in a 1/4" spacer to make sure that there is no rubbing do to axle movement when driving?

Any info you have would be greatly appreciated.

Thanks!