My two cents...perhaps all it's worth.
Any UNDER FRAME storage should be mounted as closely as reasonably possible to the axles. In so doing, the running gear will keep this low-slung device as high as possible off the ground.
The farther from the axles, the less ground clearance you'll have going through the whoop-de-doos...anything ranging from a driveway upslope to a significant "breakover" crown in the road. These kinds of obstacles are common on poorly maintained roads going into boondocking sites.
Imagine what happens when your tow vehicle hits a sharp incline at a somewhat steep angle. The hitch ball and trailer coupler plunge earthward. Likewise, as the TV makes progress up the incline, the tail of the trailer plunges earthwards...to the point that the built in skid bars on the frame may ground out. Meanwhile, anything very close to the axles maintains most of its ground clearance.
The stairs on my old PUP were quite far forward from the axle, and I grounded them over and over again...to the point that I carried a 6 pound sledge to beat them back into good enough shape so they could be used. I eventually lifted the rig almost 4"...which, in turn, led to a 4" jump in the hitch ball height. The pix show the battered stairs before the lift, and the third pic shows where, on my paved driveway, the stairs carved out a gouge in the pavement...at the breakover point. Those stairs went though hell, and once I raise the rig, I took them apart, beat all the parts straight on an anvil, and reassembled them using stainless bolts in place of rivets and screws. If your "drawer" were to hit like my stairs did, it would be useless...and never slide properly again.
If you'e tucking something up under the foor, between the frame rail and the outer wall of the camper (as the OP indicated), this shouldn't be a problem. But that
hang-down drawer will be pulverized quickly if you don't mount it as closely as possible to the trailer axles.
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