We have been using Pro Vehicle Outlines for years and also bought the Bad Wrap "Hard Drive" a couple years ago. Neither are perfect in my opnion but Pro Vehicle Outlines is usually "close enough". Where is has the most problems is on the hight of things like rear side windows. For full wraps or large graphics you want to double check measurements and adjust as needed prior to print. The guy that owns it Christian, has always been very helpful in the past. For a couple of years he pretty much merged with Mr-Clipart "Car n Truck" collection and dropped the print catalog which also in my opinion sucked. Things were not as well organized and much harder to find constantly looking through a massive PDF catalog. I more often than not found myself opening my 2008 version printed catalog to find something unless it was newer. I did not get 2009 but 2010 which was the new one with no printed catalog and fully combined with the Mr-Clipart collection. I vocally complained to Christian and a lot of others did as well. In the newest version you can finally get it WITH the full print catalog again and the "Car n Truck" collection seems to be sold separate from the Pro Vehicle Outlines collection now..
I did find it amusing that on his old site he dogged on Mr-Clipart templates then merged with them...
http://www.digitalauto.on.ca/dal_prodInfo_pvoDiff.php
Now it seems you can still get them through Mr-Clipart as well as a new dedicated site.
http://www.pro-vehicle-outlines.com/ hhe original Pro Vehicle Outlines from Christian only.
or
http://www.digitaldesignware.com/int/index.php which has both Pro Vehicle Outlines and the Mr-Clipart "Car n Truck" collection. Keep in mind the "Car n Truck" collection is much more about the European market than the US market with all of the European brands.
As far as the Bad Wrap Templates. They are pretty sweet and make for great customer presentation layouts but they are not perfect. What can help is every template does include a file with actual photos of the vehicle with hand written (mostly accurate) measurements. The working Photoshop files are based on actual vehicle photos and are setup nice to lay graphics and/or wraps on. I've not bothered with updating my Bad Wrap though. Pricey and it's a very limited selection of vehicles... Also easy enough for customer presentation to simply bring a Pro Vehicle Template into photoshop, add an outside background, slight tint for glass with perf etc. too.
Makign custom templates - as mentioned - stand way way way far back from the vehicle. Do NOT frame the vehicle to fill the frame edge to edge. The closer it is to the edge of the frame the more lens barrel distortion there will be. Better to crop a ton of background out of the photos and yes - either have a measure on display in the photo or take a couple of reference measurements (like exact width of a door seam in one spot and hight in another) because you will still need to adjust the photo some to make it just right.