A couple of ideas are rolling around in my head (yes, just a couple) about getting over the barrier.
The easiest seems to be a lift kit… but they’re out of stock. Would a short section of KOP c-channel (~4") bolted below the chassis be strong enough to hold the wheels? It would raise the chassis from 3 3/8" clearance to 4 5/8" using 2011 8" wheels, plenty to go over the barrier. A skid plate of some sort might still be need to pop the wheel up a bit on approach.
We can’t test it, and see if it works, but I’d like to hear some veteran opinions on the matter.
1511 is currently doing this with 8" AndyMark pneumatics, at least for our mock/proto chassis. I believe we figured that you would need additional spacers in-between the two c-channel segments, in order to fit hardware for the frame like screw heads over the barrier. We’re currently shooting for 3/4 to 1" of clearance.
How much do the standard wheels wear down? That could possibly affect your spacing.
A tri-wheel drivetrain would be a bit heavier and thus diminish acceleration for a given powertrain, but I don’t think it would be detrimental or even all that noticeable. And I don’t see how a tri-wheel setup would turn any differently as compared to an 8WD with equivalent geometry.
We’re also going to experiment with skid plates to help raise the incident wheels a bit.
I think this is going to pretty much kill the idea of using only 2 CIMs.
If it takes more than 2-3 seconds to cross a barrier we’ll probably be facing an opponent blocker, and we’ll need all the torque we can muster.