I also don't understand why you can't go vented.
We had CW install a vented XC2100 in our coach about 18 months ago and they had to cut a hole in the coach side wall for the vent. The location for the hole was indicated on the wall by the coach manufacturer.
We have found that the best way to dry our clothes is to first pull them out at the end of the wash cycle and shake them out. Next, we dry them for about 20 to max 40 minutes and then hang them on a rack or hangers. This reduces wrinkles and allows us to get another load going sooner.