Our 1966 Aztec C had a usefull load of almost 2200lbs with a max T/O weight of 5200lbs.
I agree.
I asked the question because some of the answers did resemble those from someone who had actually flown a later generation Aztec.
Personally, I think the Aztec is the best of this bunch. Bullet proof in most respects, copes very well with weather and huge carrying capability with very good single engine performace.
Just watch the door opening mechanism!
If you have the money, buy a tatty one and have it refurbished, new panel, zero timed engines and you will have more than enough change left over from the cost of a new twin to pay for the fuel.