It's a good maybe 30 mile boat ride, you won't want to go any further south. I hold 40 gallons as well and can make it there and back keeping the boat planed with just a couple wide open bursts and still be able to fart around near big bend, maybe do a dam run and float by the casinos and still have enough gas to nudge onto the trailer.
If in doubt, throw 10 gallons in at Pirates.
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Needles bridge is right at 30 milws from the Riverside casino
Topock and Pirates are another ~10 miles farther.
They expanded the parking lot at the Riverside/Fishermans park, has a lot more truck/trailer parking, some across the street too.
Four units of water is plenty for any drive, five units, like a lake...
Have Launched at two units, and trailered there was only one unit...skinny ass water...heavy ass boat
Daniel