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what do you mean by big?  
my definition of "big" excludes framing for example.

this was never my specialty, but I worked more than a decade in the event business, and prints of that size are not so big there. the print on truck canvas cover itself is not the problem I guess and should be available for around 100,-€. A support system is the difficult task. a custom-made truss frame can easily cost a few thousand bucks. the solution with the best price/performance ratio is IMHO hem-stiching on top and bottom of the canvas like this

and a steel or aluminium tube inside. with a siple rope, you can tie this everywhere you want. The tube on bottom is neccessary for stabilization. Without it, your truck canvas would act like a flag. The hem stitching should be included or cost a small fee. the tubes you get in your local plumbing store - dunno how much, but not that expensive, I assume.

...or just use silver tape... 



Most printing companies can do 3 m wide images, the problem is the "height", which depends on the width of the printer.
I got this made at a local printing company and there is also "storbildsbolaget" in Sweden who prints building sized prints...

The prints me and bib got for the Värmlands museum exhibition will last for at least 70-100 years, that is baryte paper epson print...
Personally I like Epsons concept, it also assures that the print company only prints the amount of copies the artist ordered.