I just switched from XZA1 275/70R22.5s to XZA3 275/80R22.5s. on my 2004 DSDP. Both size tires are the same width, so they will use the same width wheels and the spacing between the rear duals will remain the same. The 80s are 2" taller so you will have 1" less clearance at the inside top of the wheel wells.
You will also need to check to see if the taller tires will clear your jacks, when you do a full lock to lock steering. If your 70s have more than an inch clearance from the jacks at full steering turn and there is more than an inch clearance to the top of the wheel wells when your air bags are deflated, you should be okay. I didn't notice any difference in steering or handling, but now I can run less air pressure in the 80s for a less harsh ride on bad road surfaces.
With the new tires I have to factor in a 5% error in the speedometer and odometer, since I am not going to have it re calibrated.
Tom
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Tom, Pat and Buster (the Boston terrier)
2004 DSDP 3807, 370HP Spartan
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