i need to install a roof rack
Well, alright, alright, alright.
Or if you prefer Nike: Just do it!
Permission granted . 
I used Yakima for my similarly-sized vehicle. Here’s how it went. FYI, I have no relationship with Yakima and have never received a free product from them. (I’m a Car Talk admin)
Yakima and Thule both do not appear to have off the shelf racks for this application. I found several through e-trailer but i’m not familiar with any of the brands.
They usually come with some sort of directions. Shouldn’t be a problem.