Love the mega files, BUT, seems like a few of the files are outdated, or contain incorrect information....ie, Moose Lodges that have RV Hook-ups, Elk lodges that have RV hook-ups, Coast 2 Coast locations. As time permits, I'll try to provide updates
It's always great to see folks ready to provide updates to the locations in the Mega File. To avoid duplicate effort and a multiplicity of databases, please note that each of the data sets in the Mega File has a "home base" somewhere, and most likely an owner who would like to get the updates. In Larry's excellent production, many of the source files come from the Discovery Owners site (including the ones you mentioned). In using the Mega File in Streets and Trips, a right click on a location icon, then choosing "Show Information" will often reveal the email address of the source file owner. Or, if you go to the Discovery Owners site MAP OVERLAYS
and chose "Sorted Alphabetically", then make any selection from the drop-down list, then look at the appropriate entry (e.g. Elks Clubs) you will usually see the email address of the person responsible for that set of files. I'll bet the contact person will be happy to get your update suggestions. Or, if no one responds to your emails, you might even volunteer (to Bob Cook, the coordinator of that site) to be the new volunteer!
(The volunteer who maintains the US Walmart database used at DiscoveryOwners and in Larry's Mega File)