I ran 33s ad 32s on highway with 5.29s for a few years.  Really drivable and good mileage too. I usually broke 20 mpg after taking the speedo difference into consideration. You could load the thing up like crazy and it pulled passes in 4th gear no problem.  You could push headwinds in 5th most of the time.

I think your 4.88/32" combo should produce similar results.