1: Get the Onan. Even though RT touts the "engine generator", running a Sprinter at idle, especially a new model, can get you a clogged diesel particulate filter, which is a $3200 expense. Plus, it is better to put the wear and tear on a generator than your vehicle's engine.
The inverter won't run the AC or microwave, but it is nice to have when late at night and wanting to plug stuff in to have it charge, or use an electric shaver.
2: Roadtrek has an extremely good name. You really can't go wrong with a RT model, but make sure you get the right floorplan. The CS Adventurous can go with a lot of the E-Trek's features, but still have a propane generator.
As for #1, Roadtrek is the top dog with sales, but Airstream is nipping at their heels, as per the figures on the class B forum.
PS: Is this a SS Agile as per the title? I'm not sure if the "engine generator" is available on this model. It might be. So, it would be a very good idea to get it with the onboard Onan regardless.
