I agree... I had add on tow mirrors on my F150....
My F350 had towing mirrors and they were incredible...I would absolutely check the box and add the towing mirrors. $600.00 is a lot but it's just a small fraction of what you are paying for the truck... It may add $5-10 bucks per payment if you are financing.
As a side question... With all the newer tech out there, why the Tundra? I'm genuinely curious...I love the Tundra and if I could use a half ton it would be a serious contender for me... But I'm buying used... And a HD Something.
Thanks!
Jeremiah