Combos were made by several American appliance makers back in the '60's
but they were not popular enough to be continued. They are not as suited
to doing large amounts of laundry as you can't have your first wash load
in the dryer and a second wash load running at the same time. The dryer
function will not hold as much as a conventional dryer of the same case
size, so if the combo washer is stuffed full it won't dry well.
The condensing dryer function of a ventless will not dry clothes bone
dry. they recommend that the clothes be taken out after a normal dry
cycle and let finish drying on hangers or out on the bed or something.
The vented combos will dry clothes as thoroughly as a separate
side-by-side or stack set. If the RV park includes the electricity in the
rent an extra dry cycle won't cost you any extra except a little wear and
tear on the machine and your clothes.
As to the cost, a conventional side-by-side set other than the absolute
base economy model will run $600+. The stack sets I see are $800. Vented
combos start around $800 and all that I see are semi-deluxe models.
The combos are smaller than the usual full size washing machine, but not
by much. They are similar to the compact size washing machines. There are
smaller models in depth but the width and height is about the same as the
larger capacity combo models.
Al G.