'High' Topper Clearance Dimensions? 3rd gen Tacoma w/long bed

Howdy, I'm looking for a new topper that provides the highest clearance to load from the back. I've researched the specs online, but challenging to piece together the info. Seeking help from Tacoma owners who have actually purchased/installed such toppers.

Examples: LEER 122 (model 62TCDC16, same as Century T-Class) or TW Mini (by A.R.E.)

Questions: (for either a LEER 122 or TW Mini) on a 3rd gen Taco with 6ft bed -
1) what is the vertical clearance to load a box with the tailgate down and the rear topper cover open? (i.e. what is the tallest box you could slide in on the lowered tailgate with the back topper door fully open?)
2) what is the minimum ceiling height (from the bed floor to the inside ceiling of the topper) at the front of the topper (nearest the cab)?

Ask: if you have this setup, share a photo from the rear (ideally showing a tape measure) with the vertical clearance - thanks!

'High' Topper Examples: (not sure if all are 6ft beds)
billybrown66(2018 black Tacoma SR5) - Here is my 3rd Gen with the 122 topper [#5]
Bau Town- I just got my leer 122 and wanted to post because there aren't too many pictures of them on third generation Tacomas [ scroll down to #10 ]
TacomaWillow(white 2022 4WD 6 cyl SR5) - New Leer 122 [ scroll down to #19]
Amzeller549(red 2017 Tacoma Pickup) - A.R.E.? [ scroll down to #8]
galaxyz [OP](silver 2016 Tacoma TRD Off Road) - [#1] - old classified ad
ORMarine[OP] (2nd gen?) - [ scroll down to #4]
tomswhitewhale (dclb white whale, 2nd gen?) - [#11]