My Grandby came without struts, and I thought I would add them until I saw this thread. Instead, I bought the speaker stand off Amazon for $77 and free shipping: [
http://www.amazon.com/gp/product/B000CD3QYW/ref=oh_details_o00_s01_i00?ie=UTF8&psc=1] and also this speaker mount bracket accessory with it for another $5.95: [
http://www.amazon.com/gp/product/B0007SL856/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1].
The tripod on it was mounted with nuts and bolts, so was easily removed without drilling out any rivets, so maybe they have changed the design from what I saw mentioned early in this thread? I put one of the rubber pads from the tripod legs over the bottom tube, as mentioned, and mounted the bracket on top. Then I cut a couple of small hardwood blocks from some 1-1/2" stock I had laying around, and glued a piece of 1/4" high-density foam rubber to the top of each one, then mounted them onto the top of the bracket with wood screws. This makes a nice U-shaped yoke to span the center latch in back and the tilt-panel lifting handle in front, and also spreads the load to two points on the roof-lift board, while keeping it centered. (You have to guide the push-handle board out through the yoke as as it slides through it while the top goes up, just to make sure it doesn't catch on the button on the bottom that secures the board to the roof with the nylon strap.)
Even with the top bracket extending it 2" or so, the jack is still a little short, so I use a 4x6" block of wood under it (6x6" might be better, as I still go right to the "Maximum" lift mark and a little beyond), with some of the same foam rubber glued to the bottom of it to prevent slipping. Despite the slight angles involved in cranking the roof up, the rubber provides sufficient friction that nothing has ever slipped yet. Going up and down is easy, even for my wife, and fairly quick just using the hand crank, without any drill attachment, IMHO, but it is nice to be able to attach a cordless drill if it's not fast enough for you without it. I find the hand cranking pace just fine myself. I don't have any roof racks or solar yet, so no load on the roof to be able to speak to the weight capacity of the stand, but it seems very adequate. Here's some pics of my setup.