Hello, very few people would list "sealing seams" as a fun thing to do, but I picked up advice years ago that considerably reduces the pain.
When cutting the top of the caulk tube open, make the cut small... you can always enlarge it a little at a time. Before you stert on the trailer, do a little practice caulking on scrap aluminum or whatever. Organize everything you might need first. Have a safe place to set the caulk gun down, and for rags, hand cleaning, tools, etc. PUT DOWN BLUE PAINTERS TAPE ON EITHER SIDE OF YOUR CAULK LINE. Caulk without panicing about every little bump or void, then go over quickly with a shaper tool or finger dipped in thinner, then carefully pull the tape before the caulk completely sets.
Store leftover caulk in the freezer for longer life.
Today is a gift, that's why they call it the present.