Wow. Talk about an old thread. I've come a long way it would seem.
You guys and your "tactical wheelbarrows" crack me up... What about sling the rifle on the right shoulder, the shotgun on the left, the pistol in a holster, and carry your ammo... That's how we always did it at Ft. Campbell...
Shooting 3gun involves carrying a lot of gear, including stuff beyond just your rifle, pistol, shotgun and a box or two of ammo.
In addition to all the regular stuff there's a lot of ancillary gear that is either mandatory, or helps to make the match a better experience. You know, stuff like eye and ear protection, a pile of magazines, magazine carriers, shotgun shell carriers, score sheets, spare belt, spare gun parts, sun block, water, snacks, spare shot timer, pens, etc. While a lot of it is little stuff, it pays to have an easy way to organize it all.
Also, some matches may or may not have a rule requiring that long guns must be cased or otherwise safely carried when brought to the line. Just slinging a rifle or shotgun over your shoulder can present safety issues.
FWIW, I'm not a huge fan of the three-wheeled carts. I've tried a number of solutions for carrying gear, including soft-sided cases that can be slung, hard-sided cases, and a backpack made for toting firearms. The last solution seems to be the most convenient and least dorky, and depending on the match, I'll use my
Eberlestock Gunslinger pack. My only gripe about the pack is that Eberlestock doesn't make a side-mounted shotgun scabbard that's long enough for my shotgun.
Besides, carrying your stuff keeps you physically fit, and when you're physically fit you will shoot better.
Carrying gear from a car to a shooting position isn't going to keep you in shape.
That's why I go to Crossfit.