fifth-wheel trailerOur editors are putting together more complete content — check back in about 20 minutesfifth-wheel trailerfifth-wheel trailer — noun名詞1. a large trailer towed by a pickup truck using a special hitch in the truck bed1.名詞釋義a large trailer towed by a pickup truck using a special hitch in the truck bed例句They bought a fifth-wheel trailer for their cross-country trip.