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Because I could not find any roof load limits for my GU wagon either in the owner's manual or on the web, I made a query to Nissan.
It took a while, but here is their response:
83019

FWIW WK Mate!
The Blokes with strengthening your rear towers advice are 100% on the money.
Regardless whether you’re towing or not brother the kinetic ‘bush pig’ downward forces will oneday start...

It's not that big of an issue. In most cases taking out overdrive it maintains speed. I think it a gearing thing, just needs a little more revs. Remember @100 km/h I'm sitting at 1800rpm.

Sent...

I swapped out the 4500 engine at 136k kms because I needed something better for towing. I did the Xcede chip & extractors + big exhaust but it still wasn't enough and was just too thirsty.
Now I...

Engines covered;
TB42S
TB45E
TB48DE
RD28ETi
ZD300DDTi
TD42Ti

Thanks to Todd, we now have the full Nissan Patrol Gu Y61 service manual including the following supplements.

For those members needing the original full factory 1998 Nissan Patrol GU Manual.

This manual covers RD28ETi.

Free download on below attachment.

Enjoy!

If anyone else needs other...