Best suspension mods to carry a slide on camper.

[matan]

First of all i am trying to find some specs for my hilux sr5 2005 xtra cab flat bed ute.
What is the kerb weight
What allowable gvm
What tare?
What payload.
I put the slide on and the rear end dropped about 10 cm. The springs were virtually horizontal. It drove not too bad, but i was very cautious. Got up to 90k on the highway. Pretty bad on bumps. Drove to weigh station and weighed the hilux and camper at 2580kg.
I am wondering what to do to stop the rear end sag and improve the handling. Heavy duty shocks 200-600 should do the trick but how will it handle when there isnt 200 kg on the back?
Airbags?
Sumo bags?
Super leaf suspension.
Who can suggest what to do?

[dave g]

GVM up grade to start with

[tazmancrash]

Try load hog spring helpers.

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[hiluxxury]

Specs: https://www.redbook.com.au/cars/details ... ITM-277877

GVM 2710kgs