Though my 5.0 is a very different trailer, I found that accessing that hose required laying on the floor and undertaking the awkward process of removing (by prying) the stapled-in-place trim and back-panel inside the cabinet below the fridge.
That provides access to the area over and to the inside face of the wheel well, and to the point where the hose penetrates the floor of fridge cabinet above and the point where it penetrates the trailer floor / shell.
The hose is 'sealed' with a shot of spray foam both where it penetrates the floor of the fridge cabinet and where it penetrates the trailer floor. That foam can be 'carved out' with a narrow 'Xacto' knife blade.
None of this is particularly easy, the workspace is very awkward, but it is do-able, and IMO likely the only way to extract the hose which is without 'joints / fittings' between the fridge and the exterior of the trailer shell under the bottom. Upon extraction the hose can be measured for replacement and a new hose routed through this circuitous path.
I don't envy you the task, but it seems necessary if your hose has developed a leak. Maybe someone else has an easier solution. Good Luck!
BTW, I gained access to that area for the purpose of routing electric wires, not for R&R of the propane hose which was exposed in that process.
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