For those folks renting cars in Texas frustrated over not being able to use their own transponder and being stuck with PlatePass, I have a solution for you.

Get yourself a hard case K-Tag from the Kansas Turnpike Authority. The one time cost for the hard case transponder (which is portable between windshields, unlike sticker tags used in Texas) is $25. Everything on it is post paid with regards to tolls so you don't have to put in additional money in advance of using a toll facility.

In May, the Kansas K-Tag became fully interoperable with not only the Oklahoma Turnpike Pikepass system but also with all of the Texas transponders, TXTag (statewide), E-ZTag (Houston) and TollTag (Dallas).

There is no monthly fee associated with a K-Tag account or any minimal use requirement. You could just buy your K-Tag transponder, take it with you on your trip, put it on the windshield, register the license plate temporarily on your K-Tag account and then remove it once you have returned the rental car.

confirmation: https://www.ksturnpike.com/interoperability