Im not a great big fan of lift blocks, especially trailer springs only being 1.75" wide, but they will probably work. If "I" were going to use a block, only being 1.75", I wouldn't go over 2" tall on the block...but thats just me. I did find some nice solid billet lift blocks made for 1.75" trailer springs.
I've got mine close to level behind my drw 3500. I wanted to try something else before going with a subframe lift. I went to Northern Tool and bought another 2 sets of trailer springs. I took the springs out of my camper, took them apart, took the new springs apart, got out the Stihl TS420 saw and made my own custom lift spring just like they do for the front lift kits on trucks. I made bands for the extra leafs to hold the pack in line. I put a new bolt through the spring and got new 8" U-bolts. Id have to look at my notes but I got close to 3" and the trailer still rides good, tested on speed bumps at walmart.
My truck was still high in the rear hooked up, so I took 2 of the 3 factory spacer leafs out of the rear and its about perfect now. The 2 spacers got me about 1" lower at the tailgate.
Im undecided at the point, but I may take to trailer leaf back apart and add 1 more small leaf to the pack to get it perfect....or I may just live with it. Im gonna load truck and trailer down with our stuff and decide then.
2013 Ram 3500 Laramie Cummins
2014 Eagle HT 29.5 BHDS