I spent several hours today helping to catalogue the axles. I wasn't expecting to spend that much time and forgot to take some pics. Unfortunately there's only a couple options for 10K axles. There's the 2 axles with torsion suspension and hydraulic brakes listed seperately, but the same, and 2 10K bare axle tubes listed together. They should go pretty cheap like under $100 I'm guessing and maybe under $50. It all depends if someone is interested in them. New they are 16-$1700 each. They have 43" spring centers. Talking with the foreman at the trailer shop new hubs with drums and electric brakes for them are about $800 each. Then you need wheels and tires. If a 7K axle would work there is a new unused torsion axle with electric brakes. Thinking it should go for a few hundred $$$. A torsion axle may be a good option for your packer because it would provide suspension if you hit a bump or had to travel on a rough road. You wouldn't have to do anything too elaborate to make use of the suspension like you would with spring suspension. I asked him how much safety factor axles have but he wasn't sure if there's a specific amount. He did say axles are much stronger than their ratings. I'd say if your packer is under 10,000lbs. a 7K axle might work. I can't remember if your hitch takes any weight or it pivots up and down. You're not going to be pulling the packer all the time and you're not going to be going faster than maybe 50kmh on a smooth road. Just my thoughts though. If you really want a 10K axle it might be worth looking at used equipment and scrap dealers for an old trailer that's not road worthy but has a suitable axle. The last option I can think of is to buy some 6000lb stub axles from Princess Auto and make your own axle with heavy pipe or square tubing. Hope this helps. Let me know if you want some pics.