My 2020 27U Greyhawk has the same issue. There are no hose kinks, but it might benefit from raising the connection point on the tank. I personally would not take it to the dark hole (dealership) for this easily overcome able issue. I don't want to engage in the whole design flaw issue and "somebody" should fix it for free. I get it.
If my unit will not accept fuel, I use the leveling jacks on the driver's side to either get level or get the driver's side slightly elevated relative to the passenger's side. Most of the time this is achieved using just the driver's side jacks. This process takes less than 2 minutes by me. I always have the DW unlock the cabin door prior to leaving the unit. If fuel will not flow, I reach through the driver's door and set the parking brake with my hand, I then reach up and start the unit. I walk around to the unlocked door and manually adjust the driver's side jacks. Fuel always flows after this routine. I bought the unit new, and it has 22000 miles on it.
When convenient and I don't have my head up my butt, I try to observe the pumps that I can actually access with my RV. I look for a side-to-side slope at the available, accessible pumps, and then approach that pump such that the driver's side of the RV is on the high side of the slope. When this is achievable, I almost never have to use the jacks to get fuel.
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2020 Greyhawk 27U
2020 F150
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