Under normal conditions In a house once the humidity has been removed or it is under control condensate will slow down a bit. Insulation factors are much better in a house, but when it comes to TT or RV's It is different, the walls are thin, the windows are thinner, the door seals do not seal properly, the rubber around the slide outs leak and If there is more then one slide out then there is more leakage, then you have sky lites and air vents in the roof, now the floor, heat is transfered from the frame to the bottom of the camper and warms the floor no alot but it adds to the heat load. The condensate that you see on the roof and dripping down the camper side is humidity that is being removed by the A/C unit from in side of the camper. When the A/C is on air is returning back to the A/C unit at the return and through the filter then it passes though the evaporator coil where the heat is being removed. The refrigrant in the coil obsorbs the heat from the air, this is called (HEAT TRANSFER) then it is transfered to the compressor and condensing coil then discharged to the out side. Along with the return air there is moisture that is in the air, when the warm or hot air passes though the evaporator the moisture condenses on the coil and that is known as condensation and it is discharged out side. As long as the humidity is high there should always be condensate. The normal range for humidity levels is 45-55% for people. Just a few days ago where I live the temp was at 93 degrees but the humidity was at 30%, for the amount of condensate that was produced from my A/C unit it was evaporating right off of the roof, It never had a chance to hit the ground. The heat gain on a TT or RV is tremendous with air leaks and lack of Insulation, A/C units run almost all the time and that's ok. I suggest to leave the fan control on ON so it keeps the air moving all the time and this will help with hot spots in the camper.