If you measure at or close to the 8 ft mark it is a good thing. Keep in mind that all bikes do not have the same wheelbase ( think on that). Not that a rig with too much toe in can handle quite well but tire wear will go up. However,,,toe our will create a pull toward the sidecar. ....It is lean out that creates good tracking with minimal tire wear. ....Anytime lean out is adjusted recheck toe in and visa versa. Lower mount placements can cause one adjustment to affect the other and each rig can be a little different so get to know YOUR rig. G ood idea to spin wheels to check for runout before setting toe in. Some set the wheels with the valve stem at the bottom to create a consistancy when rechecking. We go for 1/2" to 3/4" toe in at 8 feet. Less is best on most rigs . Make sure the mounts do not flex of course. Oh and yes use just the rear and sidecar wheel. Also make sure the sidecar swing arm has no side to side play(this is even more critical in a rear pivot swingarm). ....Some have shot for zero toe in and then keep adding a little at a time until the pull goes away .... kinda think this is more trouble than it is worth but it does have merit in thepry.......Exception to all of this is usually a HP rig with a huch tire on the front and center ub steering .