Printing 2-sided

Is anyone out there printing 2-sided on wide format? We are currently using HP Designjet 5500 printers to print 2-sided on custom coated paper. We manually flip the paper and forward out the paper (to print the backs) a certain distance based on trial and error with each printer and we know that we can print approx 40-50 ft before the front to back tracking gets too far off. Anyway, to my point, these printers are getting long in the tooth, and we are looking for a newer and faster model of aqueous UV printer (doesn't matter on brand) that tracks front to back. Any suggestions? Thx.