I've found that toothpicks and a good wood glue (the hide type, don't get the urethane Gorilla, too brittle, the same for the white all-purpose type) will repair most of those problems.
You'll use the toothpicks, broken off at the proper length, coated with the hide glue, to fill the hole and provide "new wood" for the screws to bite into. Use a pilot drill to start a new hole and re-insert the screws. That usually takes care of the problem and the hide glue, being a little more resilient will aid in the "bite" of the screw and take a little more abuse before letting the screw hole enlarge again, if ever it does...
My 2 cents, your mileage may vary...
2 Cats; J-Lo and Ragamuffin :R
2014 Thor Tuscany 40RX DP
2011 Ram 2500 Longhorn CTD HO
2011 Keystone Cougar 318SAB (now gone)
2008 FunFinder X 210WBS (Sadly gone)