9.00x16 translates to a 230/100 R16 tyre in our terms. For a Jeep this is going to be too wide, too tall & certainly not appropriate unless you have an engine putting out some serious power.
As for your questions, my answers are below:
1. Yes, minimum 6J, 6.5J recommended.
2. Yes, big time increase in wheel arch clearance required.
3. Nope, poorer fuel efficiency due to much wider contact patch & a lot more unsprung weight.
4. Yes, explained above.
5. Could be but this is a debatable issue. Also depends on the quality & construction of the tyre.
6. No it will not. It will move slowly & the figures on the stock gauges will be all skewed due to the bigger tyres. Plus the wider contact patch of the tyres coupled with the increased of the bigger tyres & rims will mean that the accelaration will be hurt big time.
I would suggest drop this idea since being off a JCB these tyres won't be suited for road use either. Get some nice 215/75 R15 radial, they'll be much better for your usage & more appropriate given the kind of power your vehicle has. Also, under normal circumstances they'll be much cheaper than the JCB's tyres.
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