Building my own RV

I would like to hear a few more stories on these suspension upgrades... it sounds like a no brainer since I'm right there...so going with the brass bushings sounds like a one time and it's done for good option? Those can go in the spring packs or just the plastic ones? I thought at first the zerk bolts were a good idea but now in just a day or 2, I'm really jumping onboard with the equalizer kit. I'm totally in after seeing how quick those plastic ones wear out if they can be replaced with brass....Being this is my first trailer experience, any education is welcomed. On another note: weight distribution came up again and the pin itself. Now I only cut off 4 feet in the back, and I don't think that will be a bad thing. I have a dually so when I had it on there at first,it barely made a difference of how far the bed squatted down. I weighed the trailer and I estimated it was around 8000 with 1150 on the landing gear. My build would most likely put a little more weight forward. The B&W hitch has a pin limit of 4500 pounds which literally would be half the weight of what the axles can carry...so that balance sheet is not going to happen..lol! I'm thinking if I keep it around 7 to 8 thousand with 2 on the pin would that be about right? 80/20% is what I'm hearing.