If I have to tow a splitter anywhere on the road, I throw it on a real trailer. Imho those things are only good for low speed ATV/ tractor off road use.
I have only towed mine once. The day I bought it. Now I just load it on the trailer with the quad and tie them down together.
They say it holds 4ish gallons but I am still thinking of adding a cooler on the return line to help.
I’ll zip tie a orange driveway marker to the splitter if I’m towing it but only across town to my buddy’s. Otherwise it goes in the bed.