2005 Champion 198 DC Elite
2005 Mercury Optimax-225hp (Serial#1B073011)
Pretty sure that up the system is pressurized and down there is no pressure on the rams. No sure that would cause a problem. If one has ever looked back at the motor while they are running in chop and seen that sucker dancing around back there. I am sure that puts way more stress on the trim system/transom than sitting in a garage or trailering. Other than that I store mine down because of the size of the garage................