Safety was never a reason the GM relocated the tanks.
Then only reason it was relocated in 73 was so they could build crew cabs, and later extended cabs. If you (you being a generality, not specific to any one poster) feel so compelled for safety reasons to move the tank, perhaps you'd be better off with an electric vehicle.
If you think about it, where else could you locate the tank that would be safer? With it in cab you're protected front and rear (most accidents are of this nature), and it's protected on the sides by the cab wall and pillar structures. If you're t-boned hard enough to rupture the tank and cause it to explode, you'll never know it anyway. 
If you want stowage space and/or speaker space, or more legroom, by all means move it.
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Currently on or near the homestead:
67 Chevy SWB 2WD stepside 350/3 on tree (Pat's)
67 GMC SWB 2WD Fleet 402/auto (Brian's under construction)
67 Chevy 3/4 ton 2WD 402/auto (Business Hauler)
67 Chevy 1 ton dually 2WD 396/4 speed (Former business hauler, Needs TLC)
68 Chevy 1/2 ton Suburban 2WD 250 six/3 on tree (Brian's Needs TLC)
70 Chevy 3/4 ton 4WD 350/4 speed (Pat's - Disguised as a 68 GMC)
71 Chevy SWB stepside (Crushed by tree - parts donor)
72 Chevy 3/4 ton 4WD (Parts donor)
72 Chevy 3/4 ton 4WD Suburban (Parts Donor)
72 GMC 3/4 ton 4WD 292 six/4 speed (Mine - Disguised as a 67 GMC)
81 GMC 4WD Dually Dump Body 350/4 speed (Business Hauler)
82 Camaro Z/28 355/Super T-10 (Pat's toy)
93 Caprice 9C1 (Brian's Cop Car)
02 Toyota Camry (Reliable but a souless steel and plastic hulk)
2011 2SS RS Camaro M6 Factory Hurst Shifter 
Maybe I need to sell some of this crap 
Yet another Bozo with a sawz-all
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