This thread got revived from the dead! I'll pay along anyway.....My Towmaster T50 is rated for 50K payload and I pull it with a tandem axle dump truck. I have moved a Volvo 210 on it (21 metric tons plus a thumb) and that's a bit over 50k. The trailer had no problem but the weight and friction (tri-axle=12 tires on the ground) are tough on the tow vehicle. I usually haul a 315CL w/thumb on it (+/- 40k#) and I will also add a 3,000# compactor, and/or an additional bucket and compaction wheel. The trailer tows like a dream. I chose a 50tn, as opposed to a 40 tn, in the event that I would have the ability to haul a 320 size machine if I needed to.