Just putting this out there I commuted for 4-5 years on a carbon bike from 1995 (1995 Trek 2120 Carbon ZX) and it was plenty strong, never had issues and it cost me 270 on craigslist (obviously I inspected it carefully and put a lot of trust in the seller). Hell it's still being used now as my everyday work horse bike. I wouldn't worry to much about carbon being "too weak" as some have stated, carbon is f'kin strong as long as you don't introduce weaknesses in it by crashing it 20 mph into a wall.
The only way it would be over kill is if you spent overkill money on it. Plenty of people get into bikes, buy a stupid expensive frame, find out they aren't cut out for cycling, give it up for decades, then decide to sell for pennies on the dollar. I say take advantage of that.
EDIT: Oh snap I didn't read that you were 300 lbs....I'm gonna be honest a carbon frame isn't really going to benefit you much at that weight, on top of what Darth said those frames aren't designed for Clydes that heavy.
Last edited by GhostSS; 08-03-20 at 01:53 AM.
Reason: Oh wait...