Were you still looking for options? I did PNW to midwest a few years ago. I just posted what I was looking for on UShip.com. You will get an a bunch of different quotes.
I ended up with a Texas horse girl that hauls new RV’s for RV manufacturers. She delivers RVs to the northwest. She was able to bring my trailer back on a return trip. If I remember the important thing was to make sure you hired someone with a motor carrier license and something else that i can’t remember. The good ones have the info right in the quote.
It won’t be cheap, but if the deal on the trailer is good, it can work out.