Tyres on bonnet
Yes, perfectly safe on Defs older than new style post-td5. They have weaker bonnets than the Series III but its still fine as long as you dont then walk on the bonnet as well - if you do so it dishes the bonnet in and catches on the fan cowling - simple solution, take bonnet off, invert with a brick at each corner, and jump up and down on it to straighten it
Ive had a heavy spare on the bonnet for almost 10 years now on various horrible African roads and its been fine
'91 LR 110 Def/Disco hybrid "Elsa"
Bring me the horizon....