MDA is a man-made (synthetic) recreational drug noted for its stimulant and psychedelic properties that has been used since the 1960s as a clubbing and sex-enhancing substance, with some similarities to LSD and MDMA (ecstasy). Sought after effects. 1  visual hallucinations.
A wheel alignment is done to make sure the vehicle's wheels are running parallel to each other, and that the tires meet the road at a correct angle, to fix or avoid problems such as irregular tire wear, poor handling (pulling to one side) or a crooked steering wheel.
Veteran RV-spotters use the presence of a tag axle (as well as large tire size) to separate out the truly expensive motorhomes from those that just look that way. The presence of a tag axle indicates an interior with features like stone floors, heavy, solid wood cabinetry, and a MPG gauge that quickly sticks at 1.4 when going uphill.