You don't need very high quality spacers to keep it on the tailgate. You can pick up a pair of cheap spacers on eBay for $60. That doesn't seem terrible. I believe the brake light will still be covered up tho. Here is how you can tell: try to put the tire on the door with the tailgate open so it doesn't interfere with the bumper. If it covers it up, you probably need an oversized tire carrier. If not a spacer might work. The stock carrier isn't the strongest tho, you might benefit to upgrading to an oversized tire carrier
"You didn't buy it to look at it!"
2000 TJ Solar yellow, 3.73, 178k, limited slip D44
2012 GMC sierra crew cab--Daily Driver
2008 jk X 6spd Red Rock---Sold and missed