Purchase advice 4×4 for special purposes

Hello everyone! Can someone help me? I’m looking for railcars that should be reliable, affordable and economical and that should have the following: 1.permanent all-wheel drive 2.automatic 3.diesel or for LPG powered engine 4.the 3.5 t trailer should be able to line. 5.In winter in deep snow can also drive well and in mountains where it often cuts.