If I understand the issue (cab's VIN is not a K vin plate) thenI'm not sure why this matters to you other than as a bargaining chip to get a better price. You're in NH and the truck is exempt from title laws. You only need a bill of sale to legally register it, and at least where I live, noone cross-references VINS.
As far as protecting the investment, from your description the truck is not a factory stocker (3/4 ton running gear etc) so it'll never have "numbers matching" value from a collector's standpoint. Being a 4x4 and in the northeast and rust-free will give it value. 
As far as resale without a title, it's a mute point. As I've stated NH exempts older vehicles and as such the other 49 states have to abide by our laws. I've bought and resold a few non-titled vehicles for boardmembers in the past to get them around their state's more restrictive laws. Once it's "owned" in an exempt state, a purchaser in a state that requires paperwork, need only have a bill of sale and a copy of NH DMV's exempt statute to re-title.
Anyway, good luck
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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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