I'll throw in my opinion, since I use one regularly. Due to work, I live in my 5er 2/3 of the year and bought my first trailer specifically because it came with a W/D. I have a vented Splendide, probably the most common one out there. First, they dry slowly because they're 120v more than any "vent issue." Second, you can't overload them or you'll break them. They can dry a larger quantity than they can wash, weight being the factor.
Practically speaking, you can figure on combo washing/drying two full changes at a time, and that's stretching it. I usually throw in 2 of each in one load: jeans, shirts, socks(pair), and underwear. Start when I leave in the morning, and when I'm off of work they're (usually) dry. Bed linens suck though. You can manage one sheet and one pillowcase per load, so sheets take a minimum of two loads. If you're "home" dealing with laundry, figure on one complete load taking at least 3 hours, if not longer.
Proper venting is essential with these things, as they have no built in lint filter. What doesn't get drained with the wash will eventually build up in the exhaust. Extended regular use will have the unit shutting off with error codes during the dry cycle (starts happening to me about every 1 to 1-1/2 years). A few phone calls with the very helpful Splendide repair line, and I was told to shove a water supply hose down the top exhaust port and back-flush into the unit, draining the water every so often. 3-6 times of doing this and you're good for another year or so until the lint builds up again.
So....there's my long winded endorsement of the vented combo unit. Just read the instructions carefully, as they spell out the typical shortcomings of the unit.
