I have used my Thule Evolution 1600 for years. I really like having the box to keep the dust and water off of the sleeping bags, and other camp items. I want to be able to use this box and still be able to carry items on the roof. I installed some 66" Thule load bars. They helped a bit. I was able to strap two tables and an awning on top and drive across the country. I have had problems attaching a jerry can and firewood to the roof. I need a basket of sorts to go with my box. I really do not want to spend $1300 on a roof rack if I can avoid it. I found a brand new Thule 696 rack on craigslist. The measurements are 40" wide by 62" long. If I leave one of the floor slats out I can mount it to my current 66" bars but there is quite a bit of overhang.