I have never heard of such an issue on Escape trailers. IF all 4 tires were wearing on the inside it would point to an overloaded trailer. But opposite inside tire wear points to damaged suspension in some way like hitting a deep pothole at speed. This is from the Les Schwab Tire store site:
"If all four tires are wearing heavily on the inside, the trailer is probably overloaded.
Trailer axles are built with a slight upward curve in the middle. When the trailer is unloaded, the tops of the tires lean slightly outward (toed-out, or duck-footed). When they are carrying the weight of whateverís loaded, the axles straighten to a flat position and the tires come to a straight up-and-down position.
When the load is too heavy, the axle bows downward in the middle, causing the tires to roll pigeon-toed (more on the inside shoulder of the tires). Thatís not the normal contact patch for tires, and youíll see pronounced wear there.
Another possibility is the axle has been flipped over (the bow in the axle that is supposed to be pointed up is actually pointed down).
If only one tire is wearing faster on the inside, you may have a bent suspension part, like a spindle. This can cause one tire to skid rather than roll smoothly down the road, creating heat and friction that wears out the rubber."
I would suggest that you contact both ETI and a service center that works on Dexter Axels in your area and have the suspension inspected for damage. This is a very unusual situation.