long conduit run above OR below ground.

Have a long conduit (1 or 1.5" PVC) run to make to sub panel (200+ ft).
This run is thru brush on a very rocky slope of about 15 degrees average.

Options:

1) Bury schedule 40 so top of conduit is >18" down. I know this will work but it is alot of WORK.

2) Just lay schedule 80 above ground. I've looked thru NEC and can't find anything against it. If I burried the schedule 80 I would still have to go 18" but the electrical code allows schedule 80 above ground in traffic areas.
a) I don't think I have to comply with expansion provisions as would not be a straight run with secured ends.
b) needs to be supported every 6 feet but it will lay on ground so this is not an issue.


I would rather just bury the schedule 80 4-6" but that does not look like an option.

Anyone see any issue with Option 2 (just routing schedule 80 above ground)?

Thanks

long conduit run above OR below ground.