Interesting question, I was dealing with this problem two or three years ago, when a journalist tried to make up a big story about aircraft landing gear misalignment.
Design of the landing gear is differing a lot in this respect, some aircraft allow for adjustment by selecting shims in the toque link connection, some have excentric spherical bearings in the main landing gear attach points, and some have simply nothing to adjust. In some maintenance manuals this adjustment procedure is included, for others adjustment is just done once during manufacturing and never touched again.
Highest misalignment measured during this project was 2.5 degrees, as the journo was very familiar with cars, he thought this was a dangerously high value, and landing gears will fall of airplanes soon all over the world, due to the additional loads
It was interesting to see, that some aircraft manufacturers manage to produce surprisingly accurate landing gears (misalignment below 1 minute on all four aircraft checked) without adjustment possibility, while others that have an adjustment provision, produce aircraft with more than 2 degrees misalignment.
Thinking of typical aircraft landing gear side loads due to x-wing landings or fast taxi, the additional side load due to the misalignment is neglectable. The effect on tire wear is remarkable. When we visited some operators, the mechanics knew exactly which aircraft would have the highest misalignment, simply because it has the lowest tire life in their fleet, and they were right everytime
