I have a TC24. It also has 24 HP. I run a 4' behind of it. Most of the time I could probably run a 5', but I did some cutting on Saturday that even my little 4' was bogging it and I had to slow down. First time I had ever done that. So power wise, I think you could probably use a 5' - maybe taking smaller bites. But weight wise, I don't think the TZ series could handle a 5' hanging that far back - even with the loader on. I think you had better stay with the 4'.