On a GL1800 Champion solid axle conversion, how does the rear suspension work? Shocks? Air bags? Can you change preload on the shocks? I saw in another thread folks adjusting air pressure? I am thinking about buy one so would like to know as it would make ride home a lot more comfy if suspension was set up right. WHen I brought my last trike home, suspension was NOT right (preload on softest setting) and too much air in back tires. Help me out here. thanks.