gas, or electric?
Adding much weight causes issue to either. So, as already posted - strip that sucker down to the bare essentials! Wheels, motor, fuel, steering (and just enough to attach it all). This will free-up 200-300 lbs most likely.
Bare in mind that most golf carts are design for 2x250lb persons and 2x 50 lb golf bags (say 600 lb payload). Exceeding this will;
stress your transmission
stress your engine
stress your brakes
use more fuel (less range)
so budget for maybe 800-1000 lbs (1200lbs max) of added stuff (including passengers)
if gas, bring several spare air filters (change/clean daily and after every dust storm)
if electric, plan on 12+ hours each day to charge (and a genny to charge from. this is a lot of gas)
you will overload your tranny/engine/brakes before your chassis (ie- don't reinforce the chassis - cut stuff away)
the more you hide the wheels, the better. Ideally you want your DMV Hotty to say "what the hell base vehicle is this?" when they first see your vehicle. make them look for the wheels.
plan on 4 people to carry (driver included) - 5 is better.
note; 5x 150 lbs = 650 lbs of your 800-1200 lb budget......
light it so that every square inch is illuminated at night, and it is recognizable from 1000 yards away....
that should do it....
"If you don't think too good, don't think too much" Ted Williams