Axle Self Alignment

I've had this exact same "issue" with my current travel trailer but only discovered it much the same way as the OP did with his own rig - in my case when I tried to fit the BAL Dual Axle Chocks I had been using for years on our previous travel trailer between the tires on the new one. Adjusted as short as they would go the BAL chock would just barely fit between the curb side tires with the trailer sitting on a hard flat surface, when sitting a soft surface such as sand no way I could get it to fit. :M On the street side where the sofa slide is located the chock would fit regardless of what surface the tires were sitting on. :h Measuring the gap between each set of adjacent tires showed the two sides were slightly different, about 1/4" ... but since then I've also realized that gap constantly varies depending on how the trailer is sitting, whether the slide is out, etc. I've since also measured axle alignment with a string and all the measurements match, side to side, corner to corner, axle hanger to axle hanger, etc, and can't find any discrepancies at all ... the frame isn't torqued and the axles are aligned exactly as they should be. I think now the only reason I noticed this is our previous trailer had an axle spread of 33" so the chocks always fit and I therefore wouldn't have noticed any discrepancy ... our current trailer has a narrow 29" axle spread, the chocks don't fit properly, and this is therefore the only reason I noticed it. I too have had no handling problems, no unusual tire wear issues, so I've concluded the only downside is I've had to give up using my adjustable dual axle chocks and use rubber chocks instead.