Butyl "tape" is not exactly tape. It is tape "shaped;" it is
sold in rolls, comes in gray, white & black (depending on the store), is a very good sealant for things you may have to move or remove later, you can screw through it and it seals the screws, then, too. I recommend if screwing into wood after the metal window rims and the
fiberglass, as you will likely find you are, that you first thread the screws through beeswax--good beeswax can be found cheaply in a simple replacement wax toilet ring. It helps seal the micropores in the wood to prevent any mosture that gets past the butyl tape from going deeper. There are other products if you're screwing into metal.
Look up butyl tape in the Search engine above--type it in the bottom query space, though, that works a lot better than the top space. Also see about watching some YouTube vids on the topic. You should apply it at one type of temp and tighten the screws slowly...eventually you'll snug it up (or snug it down) until some of the "tape" oozes out the edges. Then you carefully scrape that back a bit and you're done. We used a popsicle stick to scrape it because it make a nice little radius along the window trim edge. I "think" you apply it cold and let it warm up. Some people even put it in the
fridge for a while before applying if it's warm outside.
Paul wasn't very particular about application temps and did have to undo things and redo some of the butyl tape later around the belly band trim. A few spots didn't quite fill the gaps. He fixed it, though.
Cute trailer! Crossing my fingers for you that it goes well and quickly.
BEST
Kai
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Peanut
Semper ubi sub ubi. 
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