Benefits of rails vs deck?

I only have maxi Chambers on the first 2 axles of my jeep.

Only time I have issues is when the trailer is stacked in the yard and sits for a while. The air bleeds off and I could chase the #### thing around the block trying to hook up if I don't give it some air first. Especially if they hooked it with the yard truck since it's 5th wheel is about 6" lower than mine.

How much height does your Jeep add? Also what's the axle spacing from drive to jeep?

 

Depends on the trailer.
The bigger the trailer, the more it weight it saves, it's generally proportional.
Also the amount of well and sections also contributes.
My trailer is a 70ton, and I have many sections. My mains are both 20', and my rail is 5000lbs lighter than my deck. On my sections, my 10' rail is 2200lbs lighter than 10' of deck, and my 7' rail is about ~1000lbs lighter than my 5' deck, so 37' of rail is around 8000lbs lighter than 35' of deck, or whatever combination I put together.

Most of my blocks are 4' long. I've got a few longer ones for certain purposes. I'm not a fan of square blocks, 12x12 doesn't give you much option, it's 12" either way. I carry 10x12s, 8x10s, 6x8s...
The point of a rail usually involves height, so sometimes 2" is the difference between needing a pole car or not.
Like JD said, different loads use different blocks. Sometimes the same load with a different manufacturer will use different blocks, ie; I have to use 12" under a Grove RT crane, and I use 3" blocks under a Tadano.

I prefer securing to a rail, but then I'm a huge proponent of cross chaining. Also, when I hook a chain to a the rail, I know that I'm tied to the strongest point of the trailer, my anchor isn't gonna fail.
There's less "shortcuts" when tying to a rail, so that's why some guys don't like them.
And you'd best not be afraid to hang chains, cause your load is only sitting on something 4' wide so it better be secured...

 

6" on height.
68" spacing from rear drive. (120" group)

 

And here we have the flat floor,beam stretch trailer combo..
With the optional 1"X 4' X 8' sheet of T1......

 

This is the part I love to see. It's like art to me. A driver should have pride in his securement. Securement separates the healthy from the sick. When I walk through a parkinglot, I look and admire.