Ram does offer a support bracket to support the additional weight of towing mirrors. If you did not originally have towing mirrors, your truck will not be equipped with these brackets.
Most customers find that our mirrors do not require them, however in order to reduce the amount of vibration on the mirrors some customers do opt to install the support brackets. The support brackets do NOT come with the purchase of the mirrors as most customers don't install them.
If you wish to purchase them, you can purchase them from your local dealer along with the supplied hardware by asking for OEM #'s 68078242AA 68078243AA 6508709AA x6 6507161AA x6