As far as mounting blocks, I used to use just a 2 step step stool. I just bought one of those plastic mounting blocks about a month ago. I love it. I got the 3 step because it had a storage place under the top step. Its really handy to keep fly spray and last min. Things in. I highly recommend the 3 step mounting block. The 2 step didn't have the storage compartment.
I'm like FresianSH on the trail, just use whatevers handy and use the terrain to your advantage. If I'm on a hill I just put her in the downhill side and I can get right on. I've also used the wheel fenders on the trailer, rails on a fence and rocks, just whatever it takes to get my fat bottom up there