I've used a printer out of Michigan , Juxtapose Printing and they have printed banners that are the size of a 40' semi trailer of a few of my images for a bike company I do a ton of work for.
It's pretty cool to see a image that you shot that size!!
They did one of these shots 5' wide by about 8' tall!! It looks great in their shop!!
37681 Schoolcraft Rd
Livonia, MI 48150
Phone: (734) 513-8910
Ask for Brandon