I would not even bother with 100 people... Thank them and move on. Let them know that amount of people is not worth the work it takes to move your trailer.
On the fee...no, you are a mobile vendor showing up to vend, it's what you do.
Don't get known in a small town for wanting to charge people to move your mobile kitchen. You will never get any side work.
If you were a caterer, charging by the head and you had a long distance to go, you might be able to add something in there.
Draining the fryer is not a big deal. Drain in to a stock pot, down to the burners and let it ride in the sink.
I do it all the time, only takes a minute.
I also have a 20' trailer, last time I weighed it, was close to 14,000lbs....not a problem to move around if you have the right tow vehicle. Mine will go down the hwy at 70 mph no problem.
<message edited by chefbuba on Wed, 07/27/11 11:47 PM>