Not sure if this post is in the proper place. I have a 5er and on one of the slide outs the top seal is cracked in the corner and starting to tear. The remainder of the seal is fine, including t...
Replacement would be your best bet. Or, cutting out the torn area and as best you can, refitting a new piece. You can buy all kinds of rubber seals online. They come with glue in place and it does stick really well.
Perhaps someone will come along with something better, but tape might just be a big mess.