One way to check out articulation is with an RTI (Ramp Travel Index) ramp.
Here is an awesome calculator that will let you see how your score stacks up.

Don't Know My RTi Know My RTi
Height (in) Degree Ramp
Wheelbase (in) Wheelbase
RTi
       
Ramp Degree RTi Distance Traveled Distance for a 1000 Rti
20 Ramp
22 Ramp
23 Ramp
25 Ramp
30 Ramp
35 Ramp

Created By Robert Cole (C)2001 Daedalas Productions Inc