what am I supposed to do, if xtable doesn't know a special command. For example assume the estimation of a tobit model, like this:

`require(AER)`
`require(xtable)`

`attach(cars)`

`tob<-tobit(dist~speed)`
`summary(tob)`

`xtable(summary(tob))`

`detach(cars)`

the output of summary is pretty similar compared to an output of a linear model... What can I do, to make xtable understand, that I want to have the coefficients in a Latex table? Samme with other functions like `summary(zeroinfl(<model>))` from the pakage `pscl`?
What would you guys recommend to do?