I would be very reluctant to use the handbrake on a vehicle where it has a transmission type brake. I believe the movement in the drive train would counteract any benefit gained by having it on and put undue load on it.
The do/don't concept of leaving them in gear has been discussed at length before, but I would hazard a guess that that person who chooses to put them in gear is not liable for any gearbox repairs.
If the vehicle is secured correctly and even has an additional safety chain (that is not under tension), there should be not need to put potentially damming loads on drivetrains.
As far as resources and skills to tie a vehicle down by the wheels, I think it would be the most simple of all the methods, you do not have to crawl under the car and you can see the straps in your mirrors while driving.
my 0.03c

