When I bought my '73? glastron I slowly discovered many thngs that the previous owner was wrong about. So now I am going over a number of things. I am leaving on a long trip in a couple of days and my trailer tires are bald down the center because the guy told me they were fairly new and to keep them fully inflated - I now see that this was not the right thing to do. I have two questions:<br /><br />I need to determine the weight of my rig. Does anyone know approx. how much a '71 Merc 650 weights? <br /><br />and<br /><br />I have no docs on my trailer or the tires currently on them and they may have been chosen incorrectly. The tires are rated at max 60psi @ 750lbs. If I can add up the weight of my rig how do I know the proper tire pressure? <br /><br />Thanks