First of all, it would seem highly unlikely that you would need to have your steer and drive tires be at the same pressure, let alone the maximum sidewall pressure. Don't you know your wheel weights and don't you inflate your tires to match those weights?
Anyway, that being said, I would always want the tires on the same axle to have the same pressure so if you replaced only a single steer tire I would most definitely want the other to have the same pressure. Reading your comments, I presume you don't have a TPMS system on your MH. I wouldn't be without one; I know my tire pressures to the nearest one psi.
Joel