To put it in perspective, to get 475 lbs of torque you need at least a 4 foot cheater bar and then apply 118 lbs of force/pressure to the bar to obtain 475 lbs of torque, or a 5 foot bar and apply 95 lbs of pressure. best to get some one who has a torque wrench that goes that high, Your MH has what is called a "Hub piloted system and the lug nuts have washers attached to the lug nuts and you should put 2 drops of oil between the washer and the nut before torquing. This is criticle so get it done before you drive any further or you will have a wheel come off. Her is a link to an article that tells you all about this hub piloted wheel system if you are interested.
Hub piloted