Well, I don't know as much about the A3 as I do about the A2 (which still isn't much). So, are you more concerned about maintaining a stock look? Or do you want something that looks flashier? Will the knobby (like the Michelin XL look) 46" tires fit ok on the A3? There's a small gap for the A2, is it the same? Also, if you were primarily driving in the mud/off road you'd want a tire to reflect that. If you were primarily driving on-road, then maybe you'd want something that a modern truck/bus uses.
Do you use your truck in any sort of extreme activity? If not, I don't believe it really matters what the offset is on any wheel you use, and this can give you some additional options when looking around. With the way military trucks are over-engineered, I'm not even sure it would matter.
Also, what's your budget? If you can travel, you can find used tires at various auctions (ironplanet for example, there are others) that can save you some money, sometimes. If you can put up with 60-70% wear, you can often find tires on ebay.