It really depends on the truck, let us look at my regular cab 521 work truck, it basically has the same wheel base as cab/chassis 720 which is a regular cab on a kingcab frame/chassis, if I put 1000 lbs on the truck I put quite a bit of it in front of the rear axle, what this does is put more weight on the front suspension compared to if I centered the weight over the rear axle, what I am doing is putting 1/3rd of the weight on the front and 2/3rds on the rear, I am not taking weight off the front, I putting less weight on the front and more weight on the rear, I do it this way as the rear suspension is way stronger that the front suspension, my truck squats evenly and drives just fine as long as I am on nice roads, it's not so nice on crappy roads.
Let us look at your Bonneville salt flats race truck, it is a regular cab/short box truck, if you had been lucky and gotten a regular cab long box truck with the longer chassis it would have been way easier to add weight in the box in front of the rear axle(better if added on the underside of the box) and have the truck squat more evenly as weight was added, again your not taking weight off the front, your just adding less weight to the front than you are adding to the rear.
Here are 2 wood loads I have carried on my truck, I have done this hundreds of times.
I have been doing this too this truck for close to 20 years now, except for power steering issues because of where I mounted the power steering gear(frame damage), I have had no issues hauling these loads, when I tore my roof off and threw it in the back of my truck I rolled over the scales at 7200lbs, my 521 work truck weighs 3400lbs empty with me in it, it does take time to get these kinds of weights moving, it also takes time to stop these kinds of weights.
Here is a ton on the bed.
And a ton in the trailer.
This truck of mine is purpose built, but as I mentioned it basically has the same wheel base as the cab/chassis option with a regular cab.