Figures show [ forget where I saw them ] that Series and Defenders have one of the lowest level of fatal and serious injury numbers for accidents on the road. It is just not the strong chassis but the fact it is not a fast vehicle and is generally not driven like a hot hatch by owners.
Been in a couple of bumps in my Ninety. A Volvo estate pulled out in front of me and the impact in its side removed the rear axle, Had my youngest daughter in her baby seat [ a basic plastic thing nothing like todays baby seat ] No injury to baby, wife or self. Landy was repaired, bumper, wings and steering components. [sub 25mph contact.
Another coming together was in ice snow conditions. The speed was low however the bump was with my neighbour who was in another Ninety! Result was much like the pic above. Both landy's were fixed.
Saw a 2a that had head on with a bus, both drivers had leg injury's and recovered. Recon that in just about any car of the time [70's] Series driver would not have survived.
A series is not easy to roll, low center of gravity [ have been over a good few times on 4X4 Trials where the limits are pushed, even in just a plain hard top. All low speed stuff.] If worried internal roll bars are available.
Some complain of no crumple zones with a Landy Others say Landy's just use the other vehicles crumple zones. Works most of the time I recon but not when other vehicle is a Landy.