I had an 08 GL1800 with Champion solic axle and when driving it home from Tennessee with the wife on pillion, the trike was MISERABLE. The guy I bought it from weighed probably 400 lbs and I never thought about it but the GL1800 has air shocks that were set to pretty close to max pressure. Once I thought about how we bounced into the air on each bump in the road, I set the pressure down to a normal one for two-up and it rode pretty decent. The solid axle will always ride a bit harder than independent and we now have a Roadsmith conversion for that reason. For the driver, it doesn't make a ton of difference but my wife got a sore tail on bumpy roads (like coming across IH20 in Louisiana)!