When I first heard that the price of a new RV wasn't finalized until delivery, I too thought as many other posts, that this was an outrageous practice. I just listened to a long video from a dealer talking about Newmar's ending its price protection policy.
In essence, the pandemic and supply issues have changed everything. From the date of order to completion, it seems that the manufactures have no control over the increase costs of the materials as they are purchased and installed.
If your interested, check out
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It's long, perhaps boring but it will give an interesting perspective. Although the example of a high end motorhome is more severe than that of a 5th wheel, the point is the same.