26x9.5x14 QTP on 5.5” Rally Wheels

Will it be ok? Yes, but why not get the correct wheel to make it work correctly?

Minimum, you want the wheel width to be equal to the tread width. Drag radials like a wide wheel, as close as you can get to the section width.

I run a 13.1 section width tire on a 11.25" wheel.

One thing to mention, is if you run a wheel wider than the measuring wheel the company used, the section width of the tire will increase.