Depending on how you ask Escape to wire your port, you may save some $ by going with a panel without a controller. They can wire the port to the input of the trailer's built in controller, in which case, any panel can be used.
Even if you decide to wire directly to the batteries with a portable system with a built in controller, you might want to look at Eco Worthy's panels
makes a very nice product, but is quite a bit more expensive. If you are going to bypass the panel controller, there is little difference between the two. Even if you are going to use the panel's controller, I find it hard to spend close to $400.00 more for Zamp's controller...
I carry a 160 watt portable panel from Solar Blvd (no longer available) to which I added a connector so I can either bypass the panel's controller or use it, depending on which connector I use. I have a port I added that goes to the input of the trailer's controller. This makes it easier to get accurate readings on the TriMetric battery monitor I installed to keep track of the amp hours in & out of the batteries.