I'm not quite as negative as Mark, but the risk of continuing rot is more than slight. You need to expose the floor to see how bad it is ("soft" covers a wide variety of ills). If it has thoroughly dried you may get by with adding a layer, but if the wood is spongy the rot is probably still spreading. And the leakage may well be continuing too. The proper solution, of course, is to remove the cabinets, pull up the old plywood and lay a new floor. Maybe replace the insulation as well. You may also find damage in the sidewalls if water has been running down inside. I think the Orbit has a metal frame sidewall, but the skin is almost surely laminated on luan plywood that can be water-damaged too.
You didn't mention the model year, but the
2008 Orbit brochure says it has a rubber (EPDM) roof. Fleetwood used EPDM membranes from Alpha Systems to build rubber roofs.