The trochaic inversion

[milo]

So, in general, is a line in IT too short to use up the middle with a trochaic inversion?

Then June rolls in and neighbors clog
the road, no room to turn around;

It sounds okay to me but I worry about disrupting the force pulling the poem along.
Or does "rolls" get demoted, "in" promoted and everyone gets kicked out of school?

When I read it, I demote rolls.  If I try to force the accent on rolls it becomes awkward

Ugh, I just can't get when it works. So much easier to be strict but less intersting variation.

But aside from this line, go you think it works as well in IT as IP?

The delightful effect of the metrical variation is still the same but - short answer - it does not work as well in IT and the reason is that ip has 5 feet to play with and one gets replaced making it still overwhelmingly IP while IT only has 4 so it is a little less.  If smoothly executed I don't think it would be an issue, though.