The bikes arent on the rack in this pic, but we have a "bike bunk" that allows you to attach your bike rack (hitch mount bike rack) to the bike bunk so you can see them as you tow. Got it from campig world.
It can be a challenge to manipulate the bikes based on height off the ground, but I find that if you put the truck a few feet away (like you were going to hook up but you stop short so you can lower the tailgate) and put down the tailgate, there is no problem at all with height of the rack.
My only concern with some of the racks for the front, is if the bikes would hang low enough that turning sharp would cause the rear of the truck to hit the bikes on the rack. That ended up being an issue with my first install. So I got a different style bike rack (which allows the bikes to sit high enough to be above the tonneau) and I reinstalled the bike bunk closer to the trailer. It has been one of the best investments we have made for our TT
2015 Rockwood Mini Lite 2504S
2015 Ford F150 Ecoboost