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self-unloading
self-unloading adj.
Brit. 
/ˌsɛlfʌnˈləʊdɪŋ/
, /ˌsɛlfʌnˈləʊdɪŋ/U.S. /ˌsɛlfˌənˈloʊdɪŋ/
/ˌsɛlfˌənˈloʊdɪŋ/ΚΠ
1853 North Amer. & U.S. Gaz. (Philadelphia) 26 Oct. 1/5 A self-unloading hay elevator.
1960 Farmer & Stockbreeder 16 Feb. 72/3 He could load five tons of chopped silage from the barn silo into two self-unloading trailers to feed 180 cows in three-quarters of an hour.
2014 Advertiser (Austral.) (Nexis) 9 Dec. 32 The company has opted for a self-propelled and self-unloading barges option.
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