Originally Posted by Inland RV Center, In
On a tandem, you can use a 3 foot level or stright edge.
Placing that straight edge on the rear tire, parallel to the ground, in the center of the tire, should touch the back of the front tire. Placing it on the front tire, it should miss the rear tire.
Make sure the trailer tires are not in any twist.
Using a ruler, measure the distance between the axle mounting plate, at the widest part of the tire, both front and rear of each tire. Subtract the front dimension from the rear dimension, and that will tell you what the alignment is.
Obviously, the above it not as accurate as alignment equipment, but it will be very close. Make sure the tires do not have a bulge in the area of measurement.
Also, make sure the axle mounting plate is not bent or deformed.
Thread resurrection time. I also have a separate thread but thought I'd jump in here as well. My left rear tire is wearing excessively on outer rib/edge. All other tires good, air pressures always good.
I used the level method indicated in Andy's post above. On left (street side) both tires line up right on the level...all four sidewall points contact the level.
On the curbside, if I place level against front tire, it misses the back tire entirely by about 3/8-1/2 inch...the front tire seems to be sitting outside the back. Or if I place the level on the back sidewall of the rear tire first, it contacts the back sidewall of the front tire, and the back sidewall of the rear tire, missing the front sidewall of both the rear and front.
So basically, what i have happening on the right side is exactly what Andy said above: "Placing that straight edge on the rear tire, parallel to the ground, in the center of the tire, should touch the back of the front tire. Placing it on the front tire, it should miss the rear tire." But on the left/street side, the straight edge contacts both tires on the front and rear sidewall.
I should note the trailer has a three-inch lift kit. We were careful to drop just one end of each axle at a time, so there should have been no side/side movement of the axles, and the axle was marked to make sure it was re-installed with the original fore/aft orientation.
Ideas? I think I've read that Inland Andy is no longer active. Any rec's for a good axle shop that could check/fix alignment within a day's drive of SLC Utah?