Think Small
Instead of moving items very large distances; why not move them small distances; it's not like you get paid per mile. You could almost entirely remove the equipment cost and drastically increase the speed of repairs for things like large trucks, ships, and even in-place mechanical repairs on large machinery systems.
Instead of needing an expensive over head crane to remove the engine from say an 18-wheeler; one of your teleporters can teleport it 20 ft to the side onto a waiting stand. This changes a multi hour task of rigging; checking; and adjusting into something that takes an instant. Moving 100,000 lbs 10 feet would use approximately 1.9 base teleports; your mechanic would not even have a bead of sweat when they are done.
Or while working on a machine there is a part that would normally require hours of unbolting other pieces to reach. Instead a teleporter can touch the part (I assume they have to be touching it to teleport it) and poof it onto their workbench. 199
Reverse the procedure to install it. This case is very ideal since you are moving small parts (<10lb) tiny fractions of a mile (5ft is about 1/1000 of a mile).
Mechanics shops for cars in the us can charge around 80 dollars per hour for labor; but if you work on specialty items such as large marine diesel engines the rate can go into the $100's/hour. You would be making the same money as normal shop from mark-up on parts and labor rates; but you could do more jobs in the same amount of time and without needing to maintain large expensive equipment; although you still would want to have the equipment in the shop (maybe buy it second hand and broken) just for appearances.
Sure your colonists will need to learn many new skills; but they will have a major competitive advantage that no-one could compete with. The best parts are:
* No Ethical/Legal/etc. issues
* 100% legitimate business, you don't even need to cook the books!
* Low chance of getting caught (all teleports happen behind closed doors) 159