BadDog said:Nothing at all on the frame and I've never noticed a problem with the chassis moving, and you won't get much softer than my springs.
My wheeling rig flops around like a fish out of water if I just tie the axles down. Honestly, my CB antenna moves less. You can walk up to the truck and lift the body up 6" off the frame.
My friend has a Furd with coils that weighs nearly 6,000lbs. It flops around even worse. When he put it on my trailer he thought it'd be comfortable to drive with just the axles held down. I'm convinced that if you took a corner fast the suspension would flex so much the body would roll over and touch the asphalt. As it was, with the front suspension squished 6" and the rear axle being bound only, it didn't feel very comfortable.
BadDog said:So, the body moving is just not a big deal as far as I can see. As far as I'm concerned, the axles MUST be tired down on these trucks specifically because of the suspension. Then, if you want to tie the body down because you feel it will somehow cause a problem, help yourself. But as others have said, for those who tie only the frame down, you are just asking to get someone killed if you don't also collapse it into the bump stops. And that's just not reasonable in most cases for these trucks given the lifts, suspension travel, and often very stiff springs. Heck, I've seen LOTS of trailer queens that don't even HAVE functional bump stops, much less something that can keep the suspension from moving when the chassis is tied down. And if it can move, it WILL move, and at best it will hammer everything from the trailer up to your truck on every hard bump, at the worst, it will break something loose, probably at the worst possible time (since that is likely when the peak loads will be delivered).
Your stuff must not move much or you don't tie it down very tight. My chain binders will pull 11" of slack. If I don't have blocks of wood to put in the suspension then I regrab and tie it down tighter. If you compress the suspension 5" chances are it's not going anywhere since that's probably 1000-1500lbs of loading. If I can jump up and down on it with my fat ass and it moves, then it's not tight enough.
My problem with using straps to the axle is:
Most people use 5,000lb or less WLL straps. My chains are the weak link at 6,600LB WLL.
Most people use cheap straps and don't take care of them on top of it. Straps have a finite lifespan, don't like sunlight, hate weather, despise mud, and will cry at the sight of the strap rubbing anything.
People use the straps improperly. The strap either rubs something or goes around something. The only thing on a strap setup that should touch anything are the hooks.
The straps aren't designed to take any dynamic forces. A set of four 3,500lb WLL straps holding down a 5,000LB rig will not like a chuck hole at 35mph. They will stretch. Since the vehicle can move independently of the trailer these forces can be amplified. Chain doesn't stretch.
One of the most amusing things about people that only tie the axles down is that they often are the ones who have their load sliding across the trailer and have to retighten every 100 miles because the vehicle "hops" because the 3500lb body is working against the thousand pounds of force that holds the thousand pounds of axle and tire to the trailer. People who move vehicles for a living use the J and T hooks that go to the frame. I suspect if a truck driver who is liable for moving vehicles and whose welfare relies on the safe transport of automobiles uses frame mounting... there must be a reason.
If you ever see a race car owner hauling off the axles let me know. Every "trailer mile" is worth four "track miles" when you don't tie the vehicle's body down.
How do you manage side hills, high speed whoops, "J" turns and other common activities with a rig that "flops around" on a trailer like you say yours does?
