Camper has "ODORS" Help Please

I have an Argosy 30 and it is a stinker! When the camper is left closed for any extended period ( over a week or so)the smell is just obnoxious. We have scrubbed the entire interior, disinfected the fresh, black and grey water holding tanks, replaced all interior carpet and hard flooring and recovered all the interior upholstery. The floor was solid through out and I painted the sub floor with primer when I put in the new flooring. I am now wondering if water could have entered the area between the bottom of the sub floor and been trapped in the insulation between the bottom pan and the sub floor, where the camper frame is located? What would be the downside of removing and not replacing the pan metal and floor insulation? I am getting pretty frustrated with this problem after chasing it for about 1 1/2 yrs. any suggestions or solutions would be appreciated. Thank you in advance for any help.:(