WHAT , you built a new shop and didn't add a bathroom. ? i can see why you need that golf cart now, for those quick runs to the house 😁 
EXACTLY!!!!
I had to run sewer and water 260' and tie in under my front step....it came in at a mere 22,000......I bought a gold cart with snow tires.....
I looked into an incinerator toilet but the are 4,000!  I am envious of your set up!  Well done.....

Mike