Have 08 Suburban LTZ 1500, just bought new trailer thats 7' wide and I wish now I had towing mirrors. (extendable) Was at my chevy dealer today for some warranty work and asked the parts guy about it. He says the GM towing mirrors (like on 3/4 ton trucks) will install but NOTHING electrical will work, mirror adjustment/turn signal/heaters/folding, nothing. I find this hard to believe. Does anybody have any experience with this?

 

For mine I use the universal ones that slide over you mirrors! They work good and you can remove them when you do not need them!