You're right. Even when I'm empty - just pulling my 10,100 lb step - I normall have 11,700 lbs on the front axle. That C-15 is quite heavy.

So, then this is not the kind of a load I want to do because I don't want to change trucks. It's too heavy for a regular tandem truck :(

You need a 4 axle tractor and a 3 axle trailer rated for 40tons

11' wide and 79,000lbs? The aluminum knee braces on that Wilson of yours would likely fold like lawn chairs :)

here is a 53 foot tridem cattle trailer, with axles almost at the back, if they can run a cattle trailer like that, why not a RGN lowboy as well? i am sure cattle trucks don't run any special permits, but maybe this trailer can only be used in canada???

53 foot cattle liner - Alberta Heavy Trucks For Sale - Kijiji Alberta Canada.

Legal in TX,OK,CO,WY,MT, ND,SD,KS, MO,and others.

yeah, that's just too heavy... i sent an email to a trailer repair company just to ask how much it'd be to turn my 48 with a 61" spread into a 53 with a 121" tandem. i should probably stick to trailers with tandem axles.

You see a lot of DD stuff that might fit on a step, but some is not safe and the customer expects you to load and unload without a dock. Many military loads require a RGN because of where you load or unload.
if you want to try DD loads, try renting a trailer or buy a 35 ton RGN, the industry standard so you can sell if you need to. You can always purchase flip later.

That load is exactly the reason I told you to go with 17.5's. If you had bought a trailer with 22.5's you would've had to permit, and added many miles. Basically that would've put the load out of your reach, because it probably didn't pay enough for all that. You dipped into RGN freight with your step deck.

Double drops are exactly that, include RGN's and the like. Two drops. There are double drops with solid necks and removable necks, hence RGN's.

Have you ever seen big equipment unload at a dealer? They don't detach. They drive it off the rear of the double drop onto a dock.

Theoretically a 3 axle step deck with a regular truck could do this. You can permit up to 20k per axle, and even if you stick to 12k on the steers it could still be done. However I really doubt you could get a 6 axle truck/trailer under 32k, and have exactly 20,000 lbs on 5 axles and 12,000 on the steer. Height wouldn't be a problem if you had 17.5" tires.

I think the other guys are right, you'd need 4 axles on the truck. Or a 4 axle RGN. It would take way too much pissing around to get the weights just right, and you're never "exactly" 20k on all axles on a trailer anyways. It just isn't possible.

I'd probably have to change the axle ratio on my truck again. No way you can pull that much weight with 3.42s. No, this is too heavy. I like those front-end loaders. The one that was 10'7" tall out of Iowa paid 3 bucks per mile. It was a bit hard to load/unload because the ramps were 40" tall, and the end of my trailer is 36" but you're right: had my wheels been bigger, I'd have to skip on this load.