Open up (bloodgulch.map) in HHT.
go to the [scen]scenery section.

open up whatever scenery you dont want (im using the stump). So goto the tree_leafy_stump_crouch tag.
You will see mod2, antr, coll, phys, shdr, and effe.
mod2 and coll are the 1s ur using.

Click on mod2. goto the dropdown menu that appears and find vehicles/warthog/warthog. click on it then click swap.


Now click on coll. find the warthog coll and swap.

SAVE

go into sparkedit and place some stumps around.
now ull see scenery cars all over the place
your done
