Dual A/C's, but only 1 duct line

Cocky_Camper wrote:
Friday, I run the generator to exercise it and ran the A/C's. When I was running just the front one, I noticed the air was barely coming out the rear ducts also, then vice versa when I ran just the rear unit. I stuck a flashlight in one of vents and discovered that what I observed was true.

Is it common to have dual A/C's and for them to be connected to one set of duct lines? In the hot and humid summers in the south, the front seems to get a little warmer at times, especially with kids opening the door every 10 minutes. Would it be okay if I was to place some duct tape in the ducts to separate the ducts for each unit? If I keep all the front a/c air blowing in the front of the coach, I figured that may help more.

Thanks!