I hardly play Ultimate Ride these day and lacking in motivation to use NoLimits. So, I ended up into offering those trees for conversion into NoLimits. They're in .mx format which should work for zmodeler and you can export them into .3ds.
Basic info on the trees/plant mod
Polycount Info- Min:somewhere near 250-400 and Max:9998 triangles
Texture size-128^2 to 512^2
On a side-note, I'm working on a lunar environment made from procedural displacement and at a polycount of about 180000 triangles to use for roller coaster stimulators.
Trees/Plant List
3D Grass
Apple Tree
Blue Rose Bush
Bush
Cactus
Christmas Tree
Corn
Dead Birch
Dead Redwood
Dead Tree
Flower
Golden Rain Tree
Mature Cypress tree
Mature Orschestnut tree
Mature Pine Tree
Oleander Plant
Ornamental Shrub
Palm Bush
Palm Tree
Poison Ivy
Weeping Willow Tree
Younger Cypress Tree
Young Orschestnut Tree
Young Pine Tree