Is my Bambi bent?

[WizardOfAZ]

I have a 20 foot Bambi, a 2018 FC 20 FB. We've had it about 9 months, put about 6000 miles on it, about 10 cumulative weeks in camp. We're new to AS but have been camping with a travel trailer for about 5 years and camping in a variety of RV styles for nearly 20 years.

Here's the issue:
I notice that if I level front to back based on a bubble in the middle of the floor, the floor at the kitchen (the back of the trailer) slopes down to the back. It's not a big slope but enough to notice when I walk to the back. If the bubble is centered in the circle when placed midway front to back, the bubble is only about a third in the circle on the floor near the back. I don't know if this issue was present from the beginning or appeared over time.

Related info is about use of the stabilizer jacks at the four corners: we often camp without bothering to extend the jacks. When I do put the jacks down there's no issue; the floor is level front to back.

So it leaves me with questions:
(1) Is it typical for the back floor to sag a bit when not supported with the stabilizer feet?
(2) Have I done damage or doing damage camping without the stabilizers? I have assumed that the stress of driving greatly exceeds any stresses of living in the trailer while stationary, so it should be fine without stabilizers.
(3) How worried should I be? Is there likely a crack or weakness in the frame that could fail in some catastrophic way?

Thanks for any thoughts.
Bill

[OTRA15]

Without the stabilizers down, when you walk to the rear of a 20' trailer [with only one axle and 2 tires] you are at the end of a long lever, and your weight changes the level-status of the entire trailer. Also the tires are not solid objects so they flex when you move around.

If the trailer is entirely level with the jacks down, you are probably way over-thinking this IMO.



Our owners' manuals say that if the trailer feels level when you walk around it, that is level enough for the fridge.

Our FC20 frames are pretty heavy-duty [apparently] for this short of a trailer, so it is unlikely the frame is bending. Any "rear end sag" you may have read about is for much older and longer Airstreams IMO.

Peter