Getting Rid of Odor Under Mobile Home?

I live in double-wide mobile home in Central Texas, the Waco area, where in the last few weeks we had 16" or more rain. I live in the country in a field where there we always have rats, mice, etc. that also get under the house, so I keep poison under there. Now an odor is coming thru the floor vents which is a combination of dead varmints, but also is more stagnant smelling with water from all the rain in short period of time.

My son in law removed 2 sheets of underpinning and then covered with wire so cats and dogs don't go under there and swarms of mosquitos also came out! He did not see any large critters, but there could be rats. He saw a few snake skins which is not unusual here. I know mosquitoes breed in standing water and there are still several big puddles around the property, but not that close to house.

I have lived here 11 yrs and never had this problem before, but in a 24 hr period we had 11 inches of rain have had addional the last few weeks. It is probably not over. It was 84 degrees on Tuesday and lowest has been 44 so far. I have septic system in back yard and it hasn't been pumped in very long time, but ground doesn't show signs of mushiness (lot of rock in soil here). I need helpful advice on how to get rid of the odor and any other suggestions to dry out. I have already filed an insurance claim because of roof damage and leakage in my house. It has just been smelly for a week now. The mosquitos will die soon. 1 piece of underpinning was removed on the southwest side (we have lots of wind from southwest) and another piece from the northeast side. Would having septic tank pumped even though the ground is not mushy help? Thanks for advice.