Hi Mary,
The tailgate/jack interference issue has been discussed in a number of threads, including here:
https://www.escapeforum.org/forums/f...ck-9298-2.html
and here:
https://www.escapeforum.org/forums/f...lbs-12126.html
I have a setup similar but not exactly like the one you are getting (2015 E21 and 2007 Toyota Tundra), and experienced tailgate clearance issues. However, there are several differences that may play in your favor. First, I have the power jack, and the jack head was primarily responsible for the clearance issue. The manual jack is less bulky and may clear just fine. Second, I have the Anderson weight distribution hitch. I am not familiar with the Fastway, but perhaps it sits an inch or two further back from the receiver. If so, that may provide the needed clearance as well. I hope one of those proves to be the case.
If not, there are still solutions available. The Jack-e-up was mentioned in the previous thread. I used that a Casita and manual jack, and it worked great. It is easy to install with the manual jack, and the manual jack is relatively light and easy to remove and store in the back of the truck once you are hooked up.
But if that approach doesn't appeal to you you may also be able to find a slightly longer ball mount that will move the ball 2-3 inches further away from the truck's receiver. That was the solution I ultimately found for my current set up when Anderson first made the longer ball mount available 18-24 months ago. I have noticed no difference in towing feel or stability, and can also recommend this approach if something similar is available that works with the Fastway.
We camp with two Standard Poodles, and they are great camping companions, so I know how important solving this issue is for you. I'm sure you can find an acceptable solution. In any case, good luck, and happy camping.
Whichever way you go, one word of caution: with the rig straight and on level ground there may ample tailgate clearance. But angles will change in the wild, and occasionally will cause obstruction. Most common is a downhill ramp onto a level parking pad that is short enough so as to leave the truck angled uphill. If you find yourself at such an angle, don't just drop the tailgate without checking the clearance.
Paul