If I was trying to pull lug nuts using a 3/8" air ratchet, I'd definitely try something else too But I think / hope you meant 3/8" impact.
Only the mid- and high-torque M18 1/2" impacts are heavy; the compact 1/2" guns are super light, small, and capable. I just ran over my old compact 2655 with a forklift, bought new plastics for $25, and it's in the game again. If it wasn't repairable, I'd have gone with it's modern replacement, the 2855. I think it's rated at 250 ft-lbs. It'll do most anything automotive and generally handle bolts with a 5/8" / 16mm thread size or smaller in real life. The bare tools are around $200 give or take $20.
If I want to put out more torque than that, I'm going to use a 3/4" M18 or I'll hook the air hose up to an air impact of 1/2" or larger size. Due to their physical size and weight, I don't like the mid- and high-torque M18 1/2" guns. There's a lot of cramped places where they're just not usable. But the heck with breaker bars for little stuff like lug nuts LOL.
PS - If you're attached to 3/8" drive size and air power, a 3/8" butterfly gun probably has the guts to pull lug nuts although I never tried mine for that. You can pick them up cheap and they store small. Just watch those RPM's; mine is a lightning bolt and I could see lug nuts flying. Pretty sure my butterfly gun has more power than my 3/8" air impact gun.