" Maybe a dumb question, but why not use the flooring and tie downs that come in the sprinter?"
You can, certainly. But the flooring will, absolutely, get torn up, and it's easier to replace (or repair) a sheet of plywood that has been laid down on top of the factory sheeting than it is to replace (or repair) the factory sheeting.
"The tie-downs work great with nylon web strapping and the floor is designed to haul (and slide pallets in and out) cargo. These trucks have been in use in Europe for a long time and my German friends tell me they use them as is."
True enough, some Sprinter drivers use the factory decking and tie downs. Some don't. It all depends on the type of freight they have to haul, and to where they are hauling it. In Europe, you can't throw a rock without hitting a Sprinter. Been there, seen it. Over there, the roads, and the traffic, and the distances traveled, are much different than in North America. For example, if the Sprinter were designed from the ground up for North America, I guarantee you it would have at least a 35 gallon fuel tank. But in Europe, a 26 gallon tank is considered a rather large one even for a freight hauling van.
If you like messing with nylon webbing, then tie downs are for you. If you like messing with tie downs at all, then tie down are for you. But if you like it quick and easy, and just as secure, then e-track and ratchet straps are the way to go. They are much easier and faster to put down and take off. Nylon webbing is good for barrels, and for loose cargo, but generally speaking, it's more of a hassle to deal with in expediting.
In fact, because of the way most shippers secure their cargo to the skid, the vast majority of loads in expediting can be handled with 2x4 e-track brackets and a single 2x4 laid on the floor in the brackets - a load bar on the floor, in other words. Some cargo is secured to itself, but not to the skid, and in cases like that a 2x4 will keep the skid from sliding forward, but it won't keep the cargo from sliding forward and right off the skid. In those cases, either a 2x6 load bar would suffice, or simply strap them down. Just keep in your mind, "What will this cargo do if I have to slam on the brakes?" and secure accordingly. You want it to move very little, if at all.
Tie down rings also limit where you can tie things off to them, whereas e-track gives you many more positions with which to secure the load.
Some people like tie down rings. More power to them. I left my tie down rings accessible in case I wanted to use them, and in every case it was more efficient to use e-track. I've since removed the rings and have never once wished I still had them. Use whatever you like, whatever works best for you.
" So you think the line X will work but it's kind of costly."
I've seen both in action, in a cargo van in expediting, and if I were going to get Line-X or Rino, it would be the Line-X. Either will work, but neither will stay in relatively pristine condition for very long at all. In every case, every owner of an expediting van with a spray-on lining has said next time they'll just go with plywood.
The only thing that I've seen that will take a beating and keep on ticking (other than a Timex watch) is diamond plate steel, as you would have in a van that has been converted as a refer unit. I've run into a guy several times who bought a used refer van (fresh fish on ice delivery) and now uses it for expediting. It's a beautiful thing to behold. Entire cargo area, floor to ceiling, boxed around and over the wheel wells, all pure diamond plate. It rolls its eyes a pebbles under a skid. A protruding nail? Ha! Child's play. A rough forklift operator? Yawn.
But, it's heavy. Very heavy. Not suited for a Sprinter at all. And the cost is out of sight.
"Do you think the cost would be worth it?"
Rino or Line-X for an expedited cargo van? Nope. Not worth the cost. Under the very worst of circumstances, you'll replace a plywood deck once a year. Even if you do that once a year for 5 years, you will still be far behind the cost of a spray-on lining. Not even close. More likely, though, a plywood deck will last at least three years, probably five, and if you keep the larger nicks and gouges repaired with bondo or wood putty, it will very likely last the life of the van.
"I know my buddy has got it in his truck and it is so slick he puts a rubber mat over it, so things don't slip around."
There's a fine line between wanting something to slide easily and something to stay put. You want the freight to slide easily when you want to load or unload it, but you want it to stick when hauling it.
The best compromise is a hard plywood deck coated with a polyacrylic (or failing that, a polyurethane is a close second, just not as hard). A poly coating serves a dual purpose. One, it helps keeps the deck clean, as oil and other spills won't soak into the wood. It also acts to hold the skid in place under a run, but at the same time allows the skid to be moved with less effort when you want to move it. I've had countless runs where a skid has been placed in the cargo area, and I've placed the 2x4 load bar an inch or two in front of the skid, only to arrive at delivery with the skid no closer to the load bar than when I started out, nor has it moved at all left or right.
Some trucks, like those who deal with moving air freight from the plane to the bonded warehouse, have recessed rollers in the floor of their trailer. When the freight is loaded or unloaded, the rollers pop up out of the floor, allowing the cargo to slide with the push of a hand. But, the cost of that system, even for a van, makes the cost of a spray on liner look like pocket change.
A spray on lining will look kewl, especially if you have the wheel wells done to protect them, as well. But, for my money, it doesn't look
that kewl.
Don't get me wrong, as I'm not saying a spray on lining will be this major mistake. It won't be. But, I think, plywood is the most cost effective method. It's most cost effective to put down, repair, maintain, and, if need be, replace.