Do a search for "straddle duals", we put a kit like this on our 2388 this year but dont know who the manufacturer is as we bought through our local tire shop. One guy can put the axle extensions and tires on in a morning and therefore easy to remove when not needed. The 18.4/38 bias is shorter than the 30.5/32 bias therefore the 32 carries most of the weight but still flexes enough that on the driveway both the 32s and 38s make an imprint. End result is you have 50" of tire per side vs 42 with true duals.