If you provide them with the proper dimensions just about any company building rear housings can give you what you need to make your wheels fit. The only problem that I could see running that much back spacing would be that to remove the wheels you would have to drop the rear end down. If that is not a problem just make sure that the rear brake hose is long enough that it does not have to be unhooked each time and make sure it is secured to keep it from being damaged.
Brian