Yes, it is normal for the condensation water to run off the roof.
We were out a few weeks ago when the humidity was high and the temps were in the mid to high 90's. The A/C did a superior job of keeping it cool inside and yes, there was water dripping off the roof.
I had my Fun Finder setup with the front left side slightly low so the condensation ran off that corner. I did not need the water/mud at the rear ramp door of the toy hauler nor on the walk in door side.
2012 Fun Finder XT 276 Toy Hauler & Harley Davidson Ultra Classic with Condor wheel chock
2014 Dodge Ram 2500 AT 4X4 Crew Cab 6.4 L Hemi, 373 gears, tow package, Rambox option, Revolver X2 tonneau cover, Equal-I-zer anti-sway hitch.