Fuse panel locate

 I looked at a few videos online and I see what you mean, it's not there. The only thing I can suggest is to look closely inside and out near where the shore power cord connects outside. I would guess that the manufacturer did not waste any extra money running the shore power cord any further than they had to. Look in all the low cabinets just in front of you to the right of the dinette as you are walking in. Also just to the left of the bedroom steps is what looks like it might be a cold air return. But look it over and see if it's maybe a false front with the breakers behind it.

Does the bed lift up and is it possibly located there? 

Another thought, does the first step up the bedroom lift up?

Wherever it is it should be readily accessible and you should not have to climb into a hole to access it. It doesn't make sense to be outside but have you looked in all the outside cabinets where the Shore Power comes in?  I don't have the videos up anymore but is there possibly a drawer just inside the trailer on the other side of the wall from from the power cord? If so try removing the drawer and see if you can see the back of the power cable. You might be able to see where it goes or at least which way it turns after it comes into the trailer.

Did you contact the previous owner, or company you purchased your 5th-wheel? 

I lightly pulled on the stair headed to the bedroom but may try to access that space soon as there appears to be some dead space there. 
the bed does lift but nothing inside and just an open storage below the bed/bed storage. 
“Cold air return” I’ve already looked inside and it’s access to the power converter and slide relays. Would make sense to be fuses in there but I cannot see any with all the duct work and not able to fit my shoulders through the hole!! lol 

great ideas, keep them coming! I’ll update when I figure this out