Ama-semi trailer ethangi le-asphalt yizimoto ezikhethekile eziklanyelwe ukuthutha itiyela elishisayo nebitumen. Lawa ma-trailer afakwe amasistimu okufakwa kwekhwalithi ephezulu kanye nezinto zokufudumeza ukuze kuqinisekiswe ukuthi itiyela lihlala lisezingeni lokushisa elidingekayo ngesikhathi sonke sokuhamba. Ama-trailer amathangi e-asphalt avame ukusetshenziswa ezimbonini zokwakha nezomgwaqo, lapho abalulekile ekulethweni kwetiyela ezindaweni zokwakha. Ama-trailer akhiwa kusetshenziswa izinto ezimelana nokushisa okuphezulu njengensimbi, ane-insulation ethuthukisiwe ukuvikela ukulahlekelwa ukushisa. 

Ama-semi trailer ethangi le-asphalt ngokuvamile afaka amasistimu okushisa anikwa amandla ngodizili noma izifudumezi zikagesi ukuze kugcinwe izinga lokushisa letiyela. Lawa ma-trailer angenziwa ngokwezifiso ngezici ezihlukahlukene zokuphepha ezifana nama-valve okunciphisa ingcindezi nezinzwa zokushisa ukuze kuqinisekiswe ukuthuthwa okuphephile kwezinto ezishisayo.