I think Article V makes it clear that it's a two step process. A convention can be called if two-thirds of the states request it. Once convened the convention can propose constitutional amendments. That's step one. These amendments must be sent back to the states for ratification. The states can ratify either through vote of legislature OR convention on its citizens. But in any event three-fourths of the states need to do so. The amendments can't be proposed and ratified in the same convention.
After 2/3 of the states have called for a convention, congress will then be required to call said convention.
Upon the creation of said convention, our current government and constitution basically ceases to exist.
All the liberal states will send their most left wing nuts, and most of the red states will send RINO’s like John McCain with real conservatives being in the vast minority.
At the convention, the convention itself will decide upon the rules of the convention.
The large liberal states like New York and California will argue for proportional representation, while smaller states will push for equal representation.
The larger states will win the argument because “it's more democratic”, “one man one vote” ect, arguments.
Now that the liberals and RINO’s are in the vast majority at the convention (due to the proportional ruling), they will then unilaterally decide how to proceed.
They will then argue that only 3/4’s of the convention delegates need agree to any changes, instead of 3/4’s of the states. And since the only people voting for such an interpretation will be ... the previously agreed upon proportionally allocated representatives, this measure will pass easily over the objection of the much smaller conservative delegations.
Then they will proceed to fully implement the lefts entire agenda.
Then they will declare that no further ratification by the states is needed, and will then proceed to form a new socialist/communist government.
Any cries from the right that they broke the rules or didn't do it right will fall on deaf ears and any legal appeals to such affect will be tried by new judges appointed by this new government.