Before the days of "slides in travel trailers" most trailers sat much lower to the ground (axles above the springs) than they do now (axles below the springs). Those older trailers were notorious for tail dragging. Our Holiday Rambler (36' long) would drag the tail on any approach ramp into a gas station. It would also bottom out going across an intersection if there was a "slope for drainage"...
Anyway, back then, nearly every trailer had a "steel triangle welded to the rear bumper support" to prevent damage to the bumper from a "happens all the time" situation. There were "rollers" designed to bolt onto those steel triangles that helped prevent wear to the triangles. Without the rollers, one trip in the southwest was all it took to need them replaced. With the rollers attached, they'd last 2 or 3 seasons before they needed any attention.... Heaven forbid you took one of those intersections at 35 or 40 MPH !!!!! That was a guaranteed way to need new "bumper wheels"....
As for "swivel wheels" I've seen them, and don't trust them to do anything other than put contact with the ground "closer because of the wheel"...
Maybe a "one or two configuration" would need some help to keep from dragging, but with the "flipped axles on nearly every trailer these days, there should be enough clearance that dragging isn't a problem... If it is, I'd first look at the rig setup to make sure the trailer isn't "nose high". Clearance likely isn't an issue on a correctly set up rig unless the trailer is well over 35' long.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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