The motorbike was so underwhelming we boosted speed up to 25max, to make it faster than the 4x4 so giving it a purpose.
We also added passenger seat on the Bike and 3rd & 4th seats on the back of the 4x4 - but not sure if this is gamebreaking yet as we did get a car bug sometime later but I think this was related to something else I was fiddling with.
2nd seat on the motorbike:
<property class="seat1">
<property name="position" value="0, 0.15, -.401"/>
<property name="rotation" value="-10, 0, 0"/>
<property name="exit" value="-.9,0,0 ~ .9,0,0 ~ 0,0,-1.5 ~ 0,0,1.6 ~ 0,1.5,0"/>
</property>
3/4th seats on 4x4:
<property class="seat2">
<property name="position" value=".6, 1, -1.66"/>
<property name="rotation" value="-5, -90, 0"/>
<property name="exit" value="1.6,0,0 ~ -1.6,0,-1 ~ .4,0,-2.8 ~ .4,0,2.6 ~ .4,2.1,0"/>
</property>
<property class="seat3">
<property name="position" value="-.6, 1, -1.66"/>
<property name="rotation" value="-5, 90, 0"/>
<property name="exit" value="1.6,0,0 ~ -1.6,0,-1 ~ .4,0,-2.8 ~ .4,0,2.6 ~ .4,2.1,0"/>
</property>