I don't know about hanging Christmas decorations on the outside while going down the highway. Too many bad things can happen - blows off, hits another vehicle, then????
Maybe something you can set up and take down would be safer. Another thing you might look into is the reuseable plastic Christmas decorations for windows. I have a couple different ones that I have used for years - just peel off the storage sheet and put on the windows. End of Christmas I reverse the process.
Now that you have me thinking decorating RV going to try them on the Vegas but only use them on the rear window when underway (keep them from being blown off). Can always put others on the sides once at the campsite.
Thanks for the idea! And Merry Christmas.
YNCM USN-Retired (64-90)
RVN (Tet 68)
2015 Thor Vegas 24.1