Just something semi-related: if you have to put in the [10 char] thing, the post probably shouldn’t be posted.
A starting 15" double lift cannot lift up 30".
If you really want to fit under the troughs with a 18" robot, put the lift in the back and have your robot do a wheelie to get under the troughs.
*Edit: Yeah so it would have to tilt back like 10 inches, so that idea’s not going to happen.
what do you mean “10 Char”
When people do something like this:
[in response to a question]
Because a post has to have at least 10 characters to be allowed to be posted in the forums to prevent spam.
[10char]
I beg to differ. There are lots of ways for starting 15" robots to reach even higher than 35".
EG Scissor lifts, 8-bar, hybrid 8 bar, reverse double 4-bar, reverse double 6-bar, a crazily built-up elevator, among others.
Then again this post was a few months ago, so you’ve probably figured all this out already.
Why on earth would you resurrect a 6 month old thread where you are debating in public with someone on your own team?
Sometimes I just don’t get these VEX forums.
Haha. I found that funny, as well. 
Especially since their team now has a lift that can most certainly get to 30" and fit under 15".
~Jordan