If I fill my tires with helium instead of air, could I haul more weight legally?

Yes

 

And if a frog had wings, it wouldn't bump its ### when it hops.

Sorry but I just have a hard time taking a question like that seriously lol.

 

Use hydrogen instead... as long as you don't have Continental tires.

 

That's day one stuff right there!! Everyone knows that.

 

Don't bother with helium, just let 1.5 psi out of each tire

 

To cut weight, try these:

-Don't top off your blinker fluid
-remove 5 lug nuts from each wheel (that's all 4 wheelers have)
-don't eat b4 you cross the scales
-make sure all your trash is thrown away (those empty soda cans add up)
-on the topic of helium.....fill up a few dozen balloons with helium and float them in your sleeper. They'll help pull the weight off the ground.

Do all these and you can save up to 1.5 lbs.
Hope this helps

 

Helium by atomic weight or mass is lighter than Room air. Which is a mix of nitrogen (75%, oxygen approx 20% and rest other gases)

You will run into thermal problems pretty quick with helium. The weight of air vs helium is negligible. You would save more weight tossing out that trashbag you have been sitting on last few days. The gain in tare is negligible.

Me thinks you have been thinking way too hard. Take some time off, relax enjoy a woman back home or something a while. Take a load off.

 

Don't forget to throw out the lot lizards before you roll onto the scale!!!

 

And that foot high stack of paper forms handed to you back in orientation, toss that too.

Then see if you can get a bucket of wrench grease.