If you mean "used Eternabond" tape in the original factory build, I would want to find out for sure if that was true ...perhaps the new Monaco company could answer that question. I've not heard of RV mfgers using Eternabond, especially not back in '04. It may be, but very well may be something else too. 'Course, that doesn't mean the bead of sealant wouldn't be the way to go...
Paul (KE5LXU) ...was fulltimin', now parttimin'
'03 Winnebago UA 40e / '05 Honda Odyssey toad