It looks like you have a bit different layout on your RV as it IS a bit different than many!
Looking at the parts drawings here may help, even though it is hard to trace the exact layout of the tubes:
https://catalog3d.winnebagoind.com/menu/Parts.htm
It looks from here as if you have three drains as mentioned and one is for the tank. However there are two more and they appear to be "low point" drains which help to clear items like the lines to the shower, etc.
There are also vents on the tank to allow air pressure/ vacuum in the tank to be relieved as you fill or drain the tank.
I might suggest two things to try to speed things along. One is that I would want to make sure the vent is clear and not restricted by something like spider webs/nests, etc. at the outer end of the vent tube.
I've marked the points where I would look in this snip?
A second idea might be to open places where air can get into the lines as a way to speed the draining on the low point drains. This can bethings like opening both hot and cold faucets at each place like the sinks and shower, as that lets air in to release the vaccumm as wtaer needs to go down and out?
Also it may be worthwhile to flip the small lever on the water heater high pressure safety to let air in there.
It does tank some time to clear through the small tubes but it should notbe an excessive time. Time I usually spend just clearing/ checking other things, likepropping the frig door open and adding the bakingsoda to keep it from getting mold/mildew smell-----or making sure I got all my personal stuff out!
See if any of that helps!
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