An impact resistant structure comprising: a. a support truss comprising: i. at least two side frames (36; 104; 240; 302; 408; 814), each comprising at least two vertical members (44; 106; 226; 306; 352; 410; 818) connected at the upper end thereof with a horizontal member (48a; 110; 172; 238; 308; 412;) and ii. a rear frame (38; 314; 420; 816) comprising at least one vertical frame post (70; 116; 228; 320; 354; 826) coextending within the rear frame along substantially an entire length of the at least two vertical members (44; 106; 226; 306; 352; 410; 818)and extending above a height of the at least two vertical members; b. a load-bearing assembly comprising: - at least one vertical load-bearing post (72; 124; 234; 328; 825) spaced apart from the frame post (70; 116; 228; 320; 354; 826) and having a height substantially corresponding to the height of the at least one vertical frame post; - at least one horizontal load-bearing beam (76; 128; 332; 440; 820) extending at least between the at least one vertical load-bearing post and said frame post; and - at least two inclined load-bearing beams (50b; 130; 166; 206; 422; 822, 824) substantially extending from the at least one horizontal load-bearing beam (76; 128; 332; 440; 820) to the at least two side frames (36; 104; 240; 302; 408; 814), characterized in that the impact resistant structure further comprises a horizontal support frame (144; 264; 844) mounted over the structure. a. a support truss comprising: i. at least two side frames (36; 104; 240; 302; 408; 814), each comprising at least two vertical members (44; 106; 226; 306; 352; 410; 818) connected at the upper end thereof with a horizontal member (48a; 110; 172; 238; 308; 412;) and ii. a rear frame (38; 314; 420; 816) comprising at least one vertical frame post (70; 116; 228; 320; 354; 826) coextending within the rear frame along substantially an entire length of the at least two vertical members (44; 106; 226; 306; 352; 410; 818)and extending above a height of the at least two vertical members; i. at least two side frames (36; 104; 240; 302; 408; 814), each comprising at least two vertical members (44; 106; 226; 306; 352; 410; 818) connected at the upper end thereof with a horizontal member (48a; 110; 172; 238; 308; 412;) and ii. a rear frame (38; 314; 420; 816) comprising at least one vertical frame post (70; 116; 228; 320; 354; 826) coextending within the rear frame along substantially an entire length of the at least two vertical members (44; 106; 226; 306; 352; 410; 818)and extending above a height of the at least two vertical members; b. a load-bearing assembly comprising: - at least one vertical load-bearing post (72; 124; 234; 328; 825) spaced apart from the frame post (70; 116; 228; 320; 354; 826) and having a height substantially corresponding to the height of the at least one vertical frame post; - at least one horizontal load-bearing beam (76; 128; 332; 440; 820) extending at least between the at least one vertical load-bearing post and said frame post; and - at least two inclined load-bearing beams (50b; 130; 166; 206; 422; 822, 824) substantially extending from the at least one horizontal load-bearing beam (76; 128; 332; 440; 820) to the at least two side frames (36; 104; 240; 302; 408; 814), characterized in that the impact resistant structure further comprises a horizontal support frame (144; 264; 844) mounted over the structure. - at least one vertical load-bearing post (72; 124; 234; 328; 825) spaced apart from the frame post (70; 116; 228; 320; 354; 826) and having a height substantially corresponding to the height of the at least one vertical frame post; - at least one horizontal load-bearing beam (76; 128; 332; 440; 820) extending at least between the at least one vertical load-bearing post and said frame post; and - at least two inclined load-bearing beams (50b; 130; 166; 206; 422; 822, 824) substantially extending from the at least one horizontal load-bearing beam (76; 128; 332; 440; 820) to the at least two side frames (36; 104; 240; 302; 408; 814), characterized in that the impact resistant structure further comprises a horizontal support frame (144; 264; 844) mounted over the structure.