All the 1/4 ton trailers use the same hub setup as the MB/GPW/Early 2A full floating axle. I don't think calling it a full floater is really accurate as there is no drive axle, just a flat plate bolted on the exposed end of the hub to close it in, instead of a stamped hubcap like you would see on a normal front wheel hub used with removeable and adjustable bearings.
The drums are the same as WWII drums and quite often they are swapped out with worn out ones so a jeep has good brakes. The brake on the trailer is only used for parking, so it doesn't get anywhere near the abuse the jeep brakes get.