The frustrating thing for us was discovering a year later that some of the "standard" wiring and connections simply don't exist on our 2008 23D International. There is supposed to be a pair of wires behind the refrigerator to connect a solar panel to the DC bus bar. Nada. Nothing exists behind ours. We had to work out something different to recharge the batteries from our external solar panel.
The manual refers to an external cable TV connection in a gray box with an exterior cover somewhere outside the trailer. Nada. Nothing exists that we can find - not in the locations they mentioned, anyway.
So in our opinion the towing stuff people mention here is of course important - but these other items like wiring solar and cable TV should be brought to the attention at the factory, not after you've gone 5,000 miles down the road.
Jim and Marsha
"Stream of Consciousness"