Is there any package in R to estimate Type IV tobit model?

I know AER package can estimate Tobit models. However, when it comes to more complicated form of tobit model, such as this one:

Y2=Y2* if Y1*>0, Y2=0 if Y1*<=0
Y3=Y3* if Y1*>0, Y2=0 if Y1*<=0

How can we estimate, is there any package for this?

Check {censReg}.

Thank you, i checked, but it only estimates left or right censored with fixed number. How do i use it when the censored bound is decided by another variable?

{crch} is another package, but I don't understand the concept of a bounds set by another variable enough to guess if it does what you want.

ok, thank you for your help

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