Ama-trailer afakwe esiqandisini-asetshenziselwa ukuthutha impahla edinga isiqandisi nobusha. Eminyakeni yakamuva, ngokuduma okwandayo kwezinto zokuhamba ezibandayo, isidingo sama-semi{2}}esiqandisi sama-trailer nawo siye sakhula, ngokuyinhloko ngenxa yalezi zici ezilandelayo:
1. Izimfuneko zezokuthutha kuzwelonke zekhwalithi yempahla ziya ngokuya ziba nzima, okwenza amaloli afakwe esiqandisini abe yisidingo sokudla okusha.
2. Ngokwethulwa kwemithetho emisha kazwelonke, ama-semi{1}}ama-trailer akwazi kangcono ukugwema ukugcwala kakhulu kunamanye amaloli afakwe esiqandisini.
3. Ama-trailer afakwe esiqandisini-angafinyelela eduze-kungabi namfucuza ekuthuthweni kwezithelo nemifino emisha, ngenani lokonga uphethiloli elingaphezu kuka-20% kanye nomehluko wezinga lokushisa ongu-±1 degree, okunciphisa kakhulu ukulahleka kwezokuthutha kanye nokuthuthukisa ukusebenza kahle kwezokuthutha.
4. Ama-semi{1}}ayisiqandisi ama-trailers avamise ukuba made, afinyelela ubude obungamamitha angu-13.5 noma angu-15. Lokhu kuvumela imithwalo emikhulu, yonga uphethiloli, futhi kunomthelela ekuthuthukiseni izinzuzo zezomnotho zizonke zezokuthutha zomgwaqo.
Ezindaweni zokuthutha-ezinde{0}}ezibandayo, ama-trailer afakwe esiqandisini -ahlala engamandla amakhulu. Ngaphansi kwesidingo esinamandla semakethe, kusengenzeka ukwenza imali ngokushayela ama-semi{3}}ama-trailer afakwe esiqandisini ukuthutha izimpahla.
