TY JOUR TI FIRE TRAILERS: HISTORICAL ASPECT, CURRENT STATE, TECHNICAL SPECIFICATIONS, CONSTRUCTIVE SOLUTION, PROBLEMATIC ISSUE KW fire foam lifter KW jib KW fire pump KW specifications KW design KW height KW offset JO Problems of risk management in the technosphere AU Presnov, A.I. AU Pechurin, A.A. AU Danilevich, A.V. PY 2019 IS 2019 PB Saint-Petersburg University of State Fire Service of Emercom of Russia