In my experience the reason that t/a caravans are relatively easier to reverse is due to the distance of the axles from the tow hitch.
A greater distance between the tow hitch and the wheels means that the caravan or trailer is slower to react to steering inputs, allowing more time for corrections during the manoeuvre.
A camping trailer, or worse still a garden trailer reacts much more quickly to slight steering inputs because the drawbar (or chassis) needs to travel further on a trailer with a longer wheelbase to have an effect on the trailers direction of travel.
Side skidding of wheels is fairly common on HGV trailers, especially those with triple axles, but twin caravan axles are close enough together to minimise the effects of side scrubbing of tyres.