The hitch height is required to determine if you need a drop-down hitch receiver to insert the tow bars. If I were you, I would determine this by having the car behind the RV with the tow bars connected on level ground. I believe the rule of thumb is a 3-inch differential. 1 1/2" above or below the hitch. I have a Ford Edge ST which sits pretty high and still needed a 2" drop receiver connected to a 36H 2019 Precept Prestige to have a level connection.
Level ground is key to getting the right measurement. The hitch receiver can be installed at any time and will not interfere with the install of your Blue Ox on your toad. I'm not sure why they need this info except to sell you the correct drop-down receiver.
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2019 36H Precept Prestige
Toad 2022 Ford Edge ST
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