53' Dry Van has water in the front on ground after rains, normal?

Palletized loads are on pallets because that's the way the consignee/receiver orders it. Has nothing to do with rain or any other weather.
Maybe @Ridgeline will elaborate.

 

A lot of the vans where i used to work would leak a little bit from the vents after a hard long rain. But the trailers were also crap so....i would get in there when its empty during a hard rain or after driving in the rain and see if you can find the leak. If its just the vents, a $0.50 shot of silicone will fix it. if its more serious you may be setting yourself up for a bad proble.

 

Have someone lock you inside on a bright sunny day and look for daylight. There are holes in the boat somewhere and a dry van isnt supposed to get the cargo wet.

If that doesnt work, break out the hose and see if you can find the water trail.

I think R/E has a smoke bomb you can light and throw inside and close the doors. Look for smoke trails.

Sometimes the water can come up from the floor or road spray from the drives.

Some ideas.........

 

It seems like All of ours leak somewhere, new and old.

 

It's called DRY van for a reason.

 

One local shipper rejected any trailer with visual light inside with closed doors. They would fudge a little for door seals but nut much.
Some had cracks in the floor. Run black silicone on them and open the doors. Scrub it all it with your boots and recheck. Floor has to be dry to do that.
Others had the side rails pushed away from the floor X members. Plates on the ends of the x members would bend and leave a gap between the rail and the wood floor. Cheap blown in scrap paper loads were good for that as well as track hoe buckets bouncing off them. In a double wall trailer you could not see that from inside.
In both of those cases tire spray, as mentioned, will flood the inside of the trailer.
Good vents were not normally a problem for us.

 

I think I understand your question. Your trailer has leaks. Some trailers have leaks, it doesn't mean they should have leaks. You might want to consider fixing the leaks before it rots your floor out, if it's that bad.

That bit someone told you about freight being on pallets because of water intrusion is the craziest thing I've ever heard. That is NOT why freight is on pallets.