Ducted A/C Unit - Bypass Ductwork for Better Cooling??

On a previous trailer I had a problem with ducts not being sealed. One time I was at the antenna crank and felt a lot of air blowing out at the crank hole. Checked my ceiling vents, and the CHEAP tape that was used to seal duct to the ceiling had come off. So got some good quality aluminum duct tape and resealed all the vents, then took off the AC ceiling grill and closed up all the visible holes where I thought that air might be leaking. Quite an improvement in system working better.