33-19.5 -15 Mt tires with corvette IRS help

[poorboiz]

OK I want to use MT 33-19.5-15 tires with my vette IRS. I know this can be done but not sure on wheels and any mode needed. I have seen a truck at one of the car shows that I went to that was like this. The bed on my truck measures 75 inches and I mocked up the tires and wheel that i have which are 15x14 5 1/2 inch back spacing and it put my track width to 79 inches, it is a stepside bed any pic or info would be awesome thanks.