Good Morning and welcome to the forum.
As you probably already know, this forum is not owned by or operated by Keystone RV. We are a group of RV owner's and people interested in Keystone RV's and have no contact with or influence over the Keystone RV company. That disclaimer can be found in red at the bottom of every forum page. To my knowledge, no employee of Keystone monitors this forum in any official capacity and there are no members who have stated that they "work for Keystone"......
That said, I'm sorry you've got a leak in what is probably the roof membrane/front cap area and also sorry that you're so far from your purchasing dealership. Keystone RV dealers are independent businesses and have no "requirement" to do warranty work on RV's that they don't sell. Some do, some don't and some who will work with you will only schedule your trailer if there is no "current customer" whose RV needs maintenance work.
If you have your owner's manual handy, check the warranty information. You'll find the following"
"Obtaining Warranty Service in Transit
Should you encounter an issue affecting the use, value or safety of your unit while traveling, contact your selling dealer for assistance. Should you need to locate an Authorized Keystone Service Center, a dealer locator can be found at www.keystonerv.com or by contacting Keystone Owner Relations Monday-Friday 9am – 4pm Eastern time at 866-425-4369."
If you haven't contacted Keystone Owner Relations, you might want to call them and discuss your problems. They may have a way to help "influence" a local dealership to schedule you a "priority appointment".
Also, please note, on page 9 of the owner's manual, the following statement:
"Your recreational vehicle was designed primarily for recreational use and short-term occupancy. Prolonged Occupancy can lead to premature component wear/failure and create conditions, which if not managed properly, may be hazardous to your health and/or cause significant damage to your recreational vehicle. These types of “Damage” are NOT covered under this Limited Warranty. Please also refer to the Owner’s Manual, Chapter 3, Prolonged Occupancy and Indoor Air Quality for more information on proper management during Prolonged Occupancy."
You might want to take the part I highlighted in red into consideration when talking with Keystone and/or the dealership. You wouldn't want to void your warranty should the fact that you're full timing in your Bullet come into consideration.
If you haven't already done so, you might want to access the roof of your RV and carefully inspect the sealed seam where the TPO roof membrane and the front cap join. That's likely to be where your water is leaking into the RV. In the warranty, you'll find that inspecting and resealing that area is an "owner responsibility" not a warranty issue. It would probably be in your best interest to stop the leak rather than think that Keystone will pay to repair all the damage that happens "months from now" when you finally get it inspected at a dealership.