I recently bought a 2014 Toyota Rav4 LE with a bare roof and I want to get a rack and crossbars installed. Just wanting to know the general basics of what I should be looking to buy. How wide should the crossbars be? What type of towers can I use and what size clips? I want to throw a cargo box on there for snowboarding and this will be the first year where I will actually have my own car to go up.