Hey Chucksterfxw, unfortunately you have learned a lesson in not having a Surge Guard. So before you go out buy a new Transfer switch consider purchasing one that includes the Surge Guard Protection. They make them in both 30A and 50A so there is no excuse. Because you are changing everything please make certain that you replace the strain relieves on the shore power cable. These ensure the cable does not move and cause the connections in the Transfer Switch Box to work there way loose.
Also, this is something that should be checked at the beginning of every season to ensure the are indeed tight.
You can pick up a Transfer Switch/Surge guard at Camping World or any big RV Dealer. It's worth the extra money now for the Surge Guard instead of paying like you are going to do, later or worse case, fire ball the MH and loose everything.