Doesn't look like it serves any function but a different look.

 

There must be a reason for it. Some trucks have the full glass roof, so it might have something to do with that.

 

I know it's going to be interesting to see how these aluminum bodies hold up to our Canadian winters and states bordering the oceans because of all the salt. They say there won't rust but I'm sure they will corrode and might have a lot of paint issues.

 

We will see in a few years, although my 99 Chev pickup has seen better days, there are many trucks of all brands that are 5 times worse than mine and of ones the same vintage as mine. It seems they are built this way on purpose this days, not to last.

 

I couldn't see any reason other than asthetic design