If you have the unit on order I would go back and request the extra insulation package. In the summer - the unit is easier to cool and in the cool weather the unit is easier to keep warm. For the investment, it's a great package. Also, I hope you ordered the 15K AC, a 13.5K in a 35' trailer will struggle.
When you take delivery, remove the hidden blocker panels and fill the systems cut-outs with expanding foam, this will deter guests.
I have a Champion electric start unit- great generator for the price and very reliable. The customer service is above all brands in the price range.
http://www.championpowerequipment.com/generators/46555/