There are exemptions that I am not up on for recreational use only trucks; but if you are intending to do this for business use it takes a heck of a lot more than an IFTA permit.
IFTA is International Fuel Tax Agreement, it only covers how the states devide up your fuel taxes. In order to get apportioned plates you must first get a USDOT number, and an MC number. In order to get an MC# you must have the appropriate insurance filings, and process agents in any state you intend to run in. Then you apply to the FMCSA for operating authority. Once you have proof that you have applied for an MC# you can get apportioned plates. You must also register w/ UCR, which is the Universal Carrier Registration system; it seems to me to be only money you send them, but there is a big fine for crossing state lines w/o it. After you do all this, and more, w/in 18 months you will be audited to see if you have all your driver, vehicle, safety and maintenance records done correctly. They don't seem to care if you really have brake shoes on your truck, just if you have a form that says you do.
The easiest thing to do is hire a service that will get all this for you, but then you still have to fill out all the reports.
Enjoy entering the world of interstate trucking, And have FUN!!!