I could probably get away with it - but I'll wait till I see how it all sits & rides …. then load it all up & put it over a weigh bridge to work out if it needs a GVM or maybe just a lift and airbags which I did in the other NP300 Navara . I reckon the Norweld canopy & tray might add 125-150kgs over the old tub and ARB canopy.
That said it's usually recommended that you do a GVM upgrade when adding a canopy - & I certainly know of blokes who were wearing out their bushes etc & eventually had to do something .
chris