I have the measurement that you requested on the Cat trailer that I have for sale or trade..
Its a 2003 Roadruner Tri axle, disc brakes on two, its 32' foot long,24' from the nose to the center axle. the bunks are 10 x 2, 17 and a half ft long. The space between is 28" inside and48" edge to edge.It has the ladder bow stop which is adjustable for different length Cats. Trailer is in exclent shape with around a thousand or so miles on it. Price is 2500.00.Picture in Swap section.
If it fits the bill for you, give me a call, office 219 962 4100 or cell 219 916 2120 days 6.30 to 6.30 . after that call my home 219 548 9500 Im up late!