We have stacked Whirlpool with vented dryer. Very few people seem to be happy with a ventless combo, we had a vented Splendid combo in our last RV which worked fine but could only do very small loads at a time and it took easily 3 hours.
If you don't want to sacrifice the space for a dryer, a vented combo could work.
Here's a trick, when the dryer cycle is almost complete take the clothes out, fold them, put them back in and finish the dry cycle, this helps to prevent wrinkles. Oh, and we always use fabric softener.
2013 RAM 3500 Dually Longhorn
2014 Trilogy 3650RL, W/D, Onan 5500, 8000# Axles, IS, 960 Watt Solar, 6x6 Volt Battery Bank, Freedom SW 3012 Inv/Charger