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Ryan_Songhurst, yours is the complete opposite experience to mine, you've been driving yours a short while, me a long time. The actual tyre is the "constant" in the equation, size aside, so something else must be the variable that's causing your problem.
Could be you (no offence intended), driving style is a high likelihood cause.
As mentioned tyre pressure, but unlikely, I run my LT225/75R16 at 50psi (rear) on tarmac (55psi hot), no problem. Always have. I'll go 5psi higher if towing on long flat bitumen. The LT is the important bit. They are rated to a max pressure of 80psi.
Suspension. Worn or leaking rear shock(s) are a primo cause of snap oversteer on utes. They often only last 40-50,000km, less if GVM is not respected.
Turbo diesels with chips. That sudden rush of ooommmpppfff on a typical crap bumpy NZ bitumen road can cause havoc with unladen rear leaf sprung vehicles. Especially when combined with heavy right foot and/or bad shock(s).
Just suggesting I'd be inclined to look for the problem elsewhere... that tyre is unlikely to be the sole cause.
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