The weather station I bought at WAL MART for $80, smaller siren looking pipe is the temp/humidity senor. Works very well. This whole trailer deal started out of getting the seaplane flying bug. The guys fly on Tuesdays and I loved it so much I wanted to fly otehr days and you need a way to egt your model when it quits way out which it always does. That led to a canoe and trolling motor and batteries and fishing rods and models all in the back of a Chevy wagon.
The trailer also enables me to take my 2 girls along, they stay busy for hours playing inside the trailer. They can lay and watch dvd's. do their homework and just play. I usually go to the field for 10-12 hours so it's nice to have a place to sit. The interent access is nice also for weather radar maps in the summer. The nice part is when I leave the house I can go flying, seaplane flying, rc boating or all of the above. It was a well worth while investment.
I eventually plan to go to some fly in's next year in the state, the trailer gives me an option of sleeping over for weekend events.