I also sealed where the bed slides are. One front corner (note some old tape covering slight opening in the seal -- I didn't redo that yet after a move):
And the rear:
Note that the prior owners redid the curtains and then removed the inner bed slide ends/cover to put matching fabric on to them. I think that they left some gaps although perhaps TrailManor also leaves some gaps there -- it doesn't seem like a good seal. One day, I will take off both covers and try to use foam or whatever method seems appropriate to try to seal the inner part of the slides.