EDIT: Looks like wmtire just beat me to it.
As mentioned above, yes. Here's something to remember, though, that may not be known or explained to you. The difference between 30A and 50A service isn't 20A, it's 70A. Why? Because 50A service is 2x 110v legs with 50A each for a combined total of 100A. 30A service is 1x 110v leg for a total of 30A.
This means you'll have 70% less current available to your trailer, if it has a lot of electric appliances then having everything working reliably on 30A service may be a challenge.
So, you really need to figure out how much current is needed to power everything you want at the same time. If the stove/oven are LP gas and not electric then you should be OK, I've only seen motorhomes going the electric stove route so far. So as mentioned that would mean only running one A/C at a time and watching out for doing things like running a coffee maker, toaster oven, hair dryer, etc at the same time.