Izihlanganisi zetreyila zizinto eziphambili zokuphumeza umbane, umqondiso, kunye noqhagamshelo lomatshini phakathi kwesithuthi kunye netreyila. Umahluko kwiindidi zabo kunye nemisebenzi ichaphazela ngokuthe ngqo ukhuseleko kunye nokuhambelana kweetreyila. Ukuqonda umahluko phakathi kwezihlanganisi zetreyila ezahlukeneyo kunceda abasebenzisi bakhethe isixhobo esifanelekileyo kwiimfuno zabo.
Ngokubhekiselele kuhlobo loxhumo lombane, izihlanganisi ze-trailer zihlelwe ngokukodwa njenge-4-pin, i-5-pin, i-6-pin, kunye ne-7-pin. Isidibanisi se-4-pin sesona sisisiseko, sibonelela kuphela uqhagamshelo lwesekethe olusisiseko kwizibane zebrake, imiqondiso yokujika, ii-taillights, kunye nocingo oluphantsi. Ifanelekile kwiitreyila ezikhanyayo ngaphandle kweemfuno ezongezelelweyo zombane. Isidibanisi se-5-pin, kwelinye icala, songeza isekethe ezimeleyo kwi-4-pin isiqhagamshelo kwaye ngokuqhelekileyo isetyenziselwa ukudibanisa isilawuli se-trailer ye-brake okanye izibane ezibuyisela umva, ukuphucula ukusebenza{10}}i-pin kunye ne-7-pin iziqhagamshelo zinika umsebenzi ongaphezulu, njengenkxaso yeziqhoboshi zombane, impendulo yesignali yesixhobo, okanye amandla ancedisayo. Ziqhele ukusetyenziswa kwiitreyila ezinzima okanye ezo zifuna iinkqubo zolawulo ezintsonkothileyo zombane.
Ngokwemigangatho yojongano olubonakalayo, iziqhagamshelo zetreyila ziphinda zihlelwe njengeNorth American (ezifana ne-7-isiqhagamshelanisi se-RV) okanye yaseYurophu (efana ne-ISO 1724). Izihlanganisi ze-7-pin yaseMntla zaseMelika zibandakanya uyilo lwesetyhula, ezixhasa ulungelelwaniso lwesekethe olunzima ngakumbi, kubandakanya imiqondiso ebuyela umva kunye namandla ancedisayo. Imigangatho yaseYurophu inokusebenzisa iiplani ezahlukeneyo zokucwangcisa, ezifuna ukuthotyelwa kwemimiselo yendawo. Ngaphaya koko, ezinye iitreyila ezikwisiphelo esiphezulu zisebenzisa uqhagamshelo olungenazingcingo okanye iziqhagamshelo zombane ezikrelekrele, zihambisa idatha ngebhasi ye-CAN ukuze kujongwe imeko yetreyila echanekileyo.
Inqanaba lemathiriyeli kunye nokhuseleko nalo lidlala indima ebalulekileyo. Iziqhagamshelo ezisemgangathweni zinokubonelela kuphela ngothintelo lwamanzi, ngelixa iimveliso zobuchule{1}zibonisa igolide{2}}izinto ezicokisiweyo, itywina lerabha, kunye nomhlwa{3}}izingxobo ezikwaziyo ukuqinisekisa ukusebenza okuthembekileyo kwimozulu embi. Xa ukhetha isiqhagamshelo, abasebenzisi kufuneka baqwalasele ukusetyenziswa okucetywayo kwetreyila, iimfuno zombane, kunye nokuhambelana nokusingqongileyo ukuqinisekisa uqhagamshelo olukhuselekileyo noluthembekileyo.