For the Doepke grader, I was simply planning some modern 1/10-size tires that look somewhat correct (I was very selective on the tread/sidewall pattern) and adding a cab to it, some exhaust-pipe detail + maybe a set of lights.  No RC action, too much engineering required at this time.  And new paint.
The Nylint roller will get a muffler and air intake setup, the cab is done, and a new paintjob.  No RC here either.
So I got around to making a pair of straps, and they confirmed what I was planning to do anyway.  To make them pulled slightly tight, it caused the skids to move.  I was planning the next design of drywall skids to be glued together into a solid block of 4 skids, so the straps merely confirmed that.  In the picture here, the skids were re-adjusted into a good position.
The straps are a PITA to make.  De-burring the brass flats, bending into a hook, threading the elastic, folding it and putting 2 pieces of heatshrink on it.  1 strap is burned a little from the little micro-torch, the other one has an imprint from where I flattened the heatshrink while it was still hot.  Better methods are needed.  They seem semi-durable, at least.  I need a better option for the brass hook, one with less CNC and debur time.  I am thinking of making them from brass flat and making the whole hook the same width, and then just CNC-ing the slot for the elastic.