Little orange cones

We recently went to a camp ground that had diagonal sites but the slant wes very slight almost perpendicular to the street. Plus there were light poles and other vehicles parked on the street. beings I had to use the drivers mirror and could not see the right side mirror it was all guess work as to where the 5th wheel was going to end up....after finally getting the rv next to the slab I thought things would have been easier if I had some little orange cones to place on the ground where the camper should end up. I have parked my camper over 120 times in the past year and this was the biggest pita. Plus the ground was wet and muddy and that did not help....