We pull a 2012 X17Z with a 2009 Honda Pilot AWD. To date we've done two trips. The first was ~500 miles round trip from northern NJ to Central PA. The second was ~800 miles round trip from NJ to northern Vermont. Both trips had decent hills, we did not have an issue, other than the surprise of the decrease in gas mileage. Normally we get 21 MPG, towing a popup we got around 15 MPG, with the new Hybrid we are down to 10-12 MPG.
Knowing that there isn't much margin on GVWR (3500 lbs) vs. the unloaded (w/full propane, awning, AC weight of ~3100 lbs), we are very careful what is packed in the camper. For reference, our Pilot normally carries 2 adults, and gear weighing a total of about 550 lbs.
We absolutely LOVE the X17Z, the beds are really comfortable, it is quick & easy to set up, and has lots of space inside for those rainy days. The only thing we would have preferred would have been the x19 - I really wanted the tandem axle, but as you know, the Pilot doesn't have the tow capacity for that model.
If you have any other questions, feel free to shoot me a PM, I'd be happy to answer as best I can.