I found another clue I think. In the lines
"From there it's no place for the meek,
The end is ever drawing nigh;
There'll be no paddle up your creek,
Just heavy loads and water high."
I think the place for the meek means earth (as in the meek shall inherit the earth), so there will be no earth as the end of it is ever drawing near (to the banks)..... I think he used "drawing nigh" to show us that there is a dead end sign. Note that sIGN has 3 letters in NIGh. Notice there is also a semi-colon ; there, a clue? Then we are in the water as he says there'll be no paddle up your creek. Just heavy loads and water high. If water is high and you cannot paddle then it may not be allowed there if it is used for drinking water or whatever or for some other reason you cannot paddle or boat there. Paddle? Dog paddle? Oar or Ore?, Loads of what? A Waterfall is high.
I think a rainbow is key here too. Look at this RAINBOW. Hmmm. .. RaiNBOW. The word BROWN can be made from letters in the word RAINBOW. I think he used ERIC SLOANE taking his name from the word amERICan as a way to hide some things in the poem. Also he took his last name from someone else and added a letter. I think this is a clue also. I have found clues leading in different directions and am not sure which is the right path or the yellow brick road. I am seeing many roads. I have been everywhere from The Wizard Of Oz and L. Frank Baum finding AU (Gold) on his gravestone....(his wife named Maud Baum) so three AU's there and he is buried at Forest Lawn in CA. Also the THINK clue Forrest said made me think of the scarecrow and some other things too led me to Over the Rainbow. I have also found clues to a baseball diamond and Catcher In the Rye stuff. A baseball diamond also looks like has a rainbow when you look at it. I have found stuff about barns and lots of other places and things. I am letting my brain go in all direction and then pull back when I think it is too far off track and not in keeping with the poem. I think we need to let the imagination run wild and take us in lots of directions. Indians and trees and lots and lots of stuff. Input anyone?