Uni bodies made of aluminum are much more difficult for current body shop technology to repair to factory designed strength, especially if they are welded together. They are also almost impossible to straighten when the damage is more than a simple dent. Manufacturers have substituted aluminum for many bolt on panels but they have resisted the transition to aluminum based uni body structures.
With repair procedures required to fix damaged aluminum uni bodies and the very limited number of shops that can actually perform that type of repair, expect exorbitant increases in insurance premiums and repair costs.
regards
Mech
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