We purchased the Escalera earlier this year and couldn't be happier. The only accessories I have so far are the big wheel attachment and the manual forklift option. I will be purchasing a trailer-hitch attachment so I can transport the Escalera with forklift more easily. Talking with Larry K. helped us find just the right options for our use.
The forklift option is a big help while I am setting up and breaking down machines; I do not have lift-table. I am able to have the cabinet up so I can completely attach all four legs at once, while I make adjustments for pitch and level. The manual gears for the forklift have an auto-lock feature which is super convenient while I am solo.
Thanks for this thread as I have found a lot of good information to further my efforts while alone.