If you feel 98% comfortable from phone and pics, you might try to pick a lake and meet in the middle.
Getting seller to travel helps assure the trailer is road worthy and they have an equal buy in to make the transaction work if there are minor issues.
Few is more disappointing than traveling that far and being significantly different than represented or the seller not willing to compromise knowing you want it and have everything invested in accepting while they just walk back inside.
I have bought two boats from the East coast this way.
Dont know where you are in the "midwest" or what part of tx but there are plenty of lakes along I-35