Well my axle finally came in, there was no way the nearly 85" width was going to be functional for me, especially when 5" of either side is just fender flares waiting to get bashed up even more. I'll be towing this thing with a 3rd gen 4runner and even with my really wide flares (on the 4runner) I'm not quite as wide as the trailer bed (very close).
I haven't seen this really documented on here in other build threads (but I didn't specifically look for it either) they essentially moved the entire wheel tub out nearly 5" on the A3 to better match the track width and allow the space for the Humvee tires. This meant that my inner wheel well tub is 5" wider than my frame. Easy enough to solve with a grinder and a welder. We cut out the entire wheel well tub, trimmed the floor back to the frame width and rewelded the entire wheel well tub like an A2 would have had it. My trailer is a bit of a "hybrid" now I guess. I would have probably been better off starting with an A2 but the A3 is what was available local to me at the time.
I flat ran out of time on this project, and the welder ran out of gas at about 9pm tonight. But, everything is in and for better or worse this thing is headed cross-country tomorrow.
I really can't thank my friend Mark enough for his welding work and shop space. We ended up fully welding the new "tongue" to the original tongue, we reused the safety chain mount by welding them to the bottom plate and he did some finish work on my front receiver tube, etc. Then we added a short receiver tube to the rear (for a slide in table that is yet to be built and bike rack), swapped the axle and moved the fenders in about 10 hours worth of work spread over two days.
It isn't finished, when I get back from this trip we are going to do some finish welding on the fenders but everything is functional.