I just bought a SR5 DC yesterday with the TM's, and I wanted them because I tow a 22' boat and a 35' travel trailer. I have yet to tow a trailer, but I am sure they are going to come in handy, especially for backing up. The built in spot mirror is really neat and eliminates blind spots. When I was researching the Tundra I sent an E-mail to Toyota asking if the mirrors could be swapped for the standard mirrors and vice versa. Their repsonse is below:
Thank you for contacting Toyota Motor Sales, U.S.A., Inc.
We apologize for your concern in finding the vehicle of your choice.
Unfortunately, the tow mirrors are factory installed and cannot be switched out with the standard heated mirrors.
Your email has been documented at our National Headquarters under file #200704060677. If we can be of further assistance, please feel free to contact us.
Brandi Galindo-Cherry
Toyota Customer Experience