I once thought about it but dropped the idea ........................ I had looked at fitting some standard hooks to end of chassis rail where bumper brackets fit or makng some new bumper brackets wiith 15mm plate with eyes for shackles but dropped the idea as a rear tow of van is not really a great idea with a tug on front or not, most chassis are not designed for that sort of loading, certainly not a snatch job at any time ............... a front winch job or long line drag really the only way to go....... did that with a large trailer on the beach once, used our large barbie plate as a skid on draw bar................ If you did a sling from both tow points is a must or chassis damage will happen same as with a vehicle.