Mirror extensions

I always used them with my Silverado. Easy to put on and take off and I could see more when backing up, especially when driving up on blocks for leveling. On the road you will see who is directly behind you, something you won't see as easily with stock mirrors. They don't help much with who is on your side, the stock mirrors do that better. Personal preference: I'd rather see more than less when I'm driving.

When you had the RX350, how well did it pull up hill? I am still debating on keeping it or getting something bigger.

I tow our RP-179 with a Dodge Dakota.  Being smaller than a full-size pickup, I felt my vision to the rear was somewhat restricted with the stock mirrors.  I purchased some clip-on mirrors and used them for the first time on a recent trip.  I found that, with the clip-on mirrors, I could actually see vehicles behind the R-Pod whereas before my vision was limited more that a few hundred feet behind.  My original mirrors may have been legal, but I found towing with the additional mirrors a much more comfortable experience.  I decided to trust my gut on this issue and not get wrapped around the "legal or not legal" aspects.  I would feel terrible if I caused an accident because I was not fully aware of my highway environment.  I like the additional coverage my new mirrors provide, but your situation, vehicle, or experience might be different.

Another thought on tow mirrors.  I usually travel at 65 mph on the freeway.  Though the speed limit around here is 70 mph in most areas, I would bet that most vehicles on the highway are traveling at 75+ mph, some much higher than that.  The mirrors give me extra time to avoid changing lanes in front of the really fast guys out there.  I felt I needed a little longer vision to stay out of trouble.  They may be breaking the law, but I bet a jury wouldn't give me much of a break if I didn't yield to the speeders.  I would be considered a contributor to the accident, at least.