Add in GTA.DAT:
IDE DATA\MAPS\veh_mods\landstalker_mods.IDE

Replace in carmods.dat:
landstal, bnt_b_sc_m, bnt_b_sc_l, exh_a_lands, fbmp_lands_a, fbmp_lands_b, fbmp_lands_c, fbmp_lands_d, misc_a_lands_a, misc_a_lands_b, nto_b_l, nto_b_s, nto_b_tw, rbmp_lands_a, rbmp_lands_b, wg_l_a_lands, wg_l_b_lands