I use an old jogging stroller with unnecessary belts and such cut away. Ammo, kestrel, etc. go into a smallish range bag with side pockets that fits easily in the seat, with room beside and in back of it for other bits like cookie bags, knee pads, etc. Game changer bag rides just right in the stroller's "foot well" and lowers center of gravity (CG).
I flat out quit trying to carry my PRS rifle in ATV mounts because it shifts CG way too high for rough terrain. Rifle is carried in a soft case laid atop the rest of the load. Most of the stages in matches I shoot are close enough together that I can push the stroller with one hand and carry the rifle in the other if I don't want to mess with "bagging" it... the mounts are good for holding a tripod and folding chair, though. (Note: the ATV mounts are fine for light rifles/PCCs/etc., just not for 18+ pound bolt guns.)
As far as other people making fun of my faded puke-colored cart: Lil' dudes, I'm 70+ years old with "hey y'all watch this" scars from growing up in the '50s and '60s and a near-fatal gunshot wound courtesy of a careless hunter that short circuited Uncle Sam's invitation to Southeast Asia in the early '70s. Somehow, being made fun of by a kid with a negative net worth and seven years of 4-figure truck payments doesn't bother me.......