Im going to have to disagree. I think you should have at least a 3/4 ton pickup to tow a 4000 machine with trailer. I have a b21 with a tandem axle 7000 gvw trailer. One brake axle. Think I'm going to put the second brake axle. I tow it with a 1ton Dodge diesel, and even in tow mode when going down steep grade hills, it takes some time to stop if you have a lead foot like myself. Someone else mentioned, to small of a truck is not always the way. Just my opinion but Id go 3/4 to 1 ton.