To expand on what Roy said:
I have not seen any Bolers or Scamps that do not have the dropped floor design (but I have not seen a Perris Pacer
, even though it looks like a Boler
clone). In other words, all of these have a dropped floor in the center of the trailer. Meaning it is "dropped" into the frame rails. The rest of the trailer (dinette area, under the kitchen, under the closet, under the front couch) is at "normal" height on top of the frame. So, although it seems like parts of the trailer are "bumps" or raised, it is actually that the middle is lowered.
The exception to this is the entryway, which is an extension of the dropped area so that you can easily go in and out. This is a built in "jog" in the frame rail on that side.
Now, where you have variations is in the front couch area. Early Bolers just have a straight-across frame member there, so the dropped floor ends at the front couch completely. In other words, the whole front couch is at the "upper" level on top of the frame, and not dropped. Thus in these trailers there is no central Porta-Potti compartment under the couch (where you can slide a Porta-Potti in and out from the main floor). If someone builds a Porta-Potti into one of these trailers, it will be about 5" higher than the main (dropped) floor.
Photos of this type:
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Later/some Bolers (and all Scamps, from what I have seen), have an additional "dropped" box built into the frame, under the center of the front couch. This is the aforementioned, floor-level Porta-Potti compartment. These have a door in the base of the couch, but the top of the couch platform goes all the way across, with just lift out panels to access the side compartments.
Photo of Scamp-type, with frame cutout but upper bench straight across:
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I think that although Robert has a Scamp
, so it does have the central dropped area in the front bench, he built his potti area on top of the frame to the side of the cutout (correct me if I'm wrong):
Photo of Robert's Scamp
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Later/some Bolers have not only the additional dropped frame compartment under the front couch, but also have the upper couch platform molded with a U-shaped cutout, which enables easy conversion to a dinette (just lift up the U-shaped cutout's lid and Voila!). I have not seen this on any Scamps (doesn't mean it does not exist, but I have not seen it).
Photos of later Boler type (from some mfg. plants) with fully U-molded bench:
I have seen folks with the early "solid" Bolers have a forward box welded in during a frame-off, and in at least one case it was even a bit wider than the standard one. Of course you have to balance it with ground clearance.
As I said above, I don't know how the Perris Pacer
is made, frame-wise, even though it looks like a Boler clone - so it may be different.