Among the problems people have had from blending is separation. Specifically the animal fats have a tendency to fall out of solution. The best way to see this is put a sample of your 'blend' in a clear bottle and watch it. Use the refrigerator to simulate colder weather. If the oil/fats separate, then when you start truck cold, a cold slug of fatty VO will be the first thing introduced to the filter and engine - not good.
The later-model PSD's (deadheaded) may be the most tolerant diesel engine to run unheated, blended VO in - but many have still had disasterous results. I would stay below 25% and insure your WVO stays in solution. Still, avoiding cold starts (ie, mostly long trips) and extended idling may mitigate problems.
I travel all over the country for work and have met lots of VO'ers. In fact, I got a few 100 gals of oil this year from poor suckers who were blending and f'ed up their trucks/cars. A couple of them even spent the money for the 'secret' ingredient... 
Poor atomization and corresponding incomplete combustion is the failure mechanism. VO is more viscous than diesel causing poor atomization and diesel has a flash point of 125-240*F vs. VO which is over 600*. Sure, the engine will run FINE, right up until the carbon build-up/coking becomes bad enough to cause problems...
I always say choose wisely - or PLEASE post pics of the carnage!! 
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Choose wisely. Or PLEASE post pics of the carnage!!!
2001 F-350, DRW, 4x4, XLT Crew Cab, flat bed, 7.3, 6 spd, Dipricol Optix gauges on pillar - EGT, Boost, Fuel Press., HPO Press. - No Muffler, AIH delete, SB Con OFE, AC code injctrs, GTP 38R. Vegistroke-inspired WVO system w/150,000 trouble-free miles! BTS tunes, 203 t-stat w/billet housing, Evans coolant, coolant filter, boost relief valve, Dieselsite IC boots, Hella headlight harness, '07 grill/lites and big, bad front bumper!
2000 Excursion 4x4 Limited - BTS trans and tunes, AIS, Frybrid/V3 SVO conversion with over 100k VO miles so far!
That's 250k miles on SVO between them! 
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