It more straining to pull a cart full of items than carrying them on youself

[l29ah]

Describe the bug
I'm playing as str4 char, and have a big problem with hauling logs and steel frames around, so i built a wooden cart, but the pain is actually higher this way:

It takes some time to move the FAT BUDDY.
You strain yourself to move the FAT BUDDY!

FAT BUDDY is 57kg.

Expected behavior
Even a weakling should be able to push a few hundreds kg around without incurring lots of pain given they have wheels in place.

Versions and configuration(please complete the following information):
0.C-37610-g8ea7031265-dirty

Additional context
save

[int-ua]

What terrain is FAT BUDDY moving over? Long grass is significantly harder to move through when you are dragging a vehicle, don't know about other types of terrain.

[l29ah]

Pavement.

[jeremyshannon]

A quick test: 6 logs with 4 strength, carried in a MOLLE/survivor duffel bag setup, I get about thirty steps before stamina runs out and pain starts up.
Put 'em in a shopping cart, and it works right, stamina stays full, no strain.
Take the wheels off the cart so it scapes along the ground: stamina stays full, but repeated straining causes pain.
Does your FAT BUDDY have "enough" wheels in the status screen?

[l29ah]

Yes.

[jeremyshannon]

There's definitely something weird going on.

I checked your save, (totally missed seeing it last night) and it works fine if I put a single set of casters on FAT BUDDY, with a rolling drag (when loaded) of like 2.5, but with your original wheels it's a strain now and then.
With a pair of 27" bicycle wheels, the loaded rolling drag drops to a puny 0.04, and the cart is completely unmoveable, as if rolling drag were being inverted.

Rebuilding the FAT BUDDY in my Testworld reproduces the problem.

[stale]

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[l29ah]

Still an issue on today's master and effectively makes low-strength characters unplayable since they cannot carry much both on themselves and in the dragged vehicles.

[kevingranade]

This is where the checks are happening, some of the math in here is definitely a bit odd.

Cataclysm-DDA/src/grab.cpp

Line 20 in 219b12f

bool game::grabbed_veh_move( const tripoint &dp )