Lots of bars like that. They require front wheel removal, which is a bit of a pain.This one looks interesting
https://www.etrailer.com/Truck-Bed-...zWrKUwjlf9FZJwwTnHmejbxgqhbm653IaAtPgEALw_wcB
Going back to the OP's question, you usually can't lower the tailgate when hooked to a travel trailer.... but you could also lift it with the tailgate down to make it easier.
You seem quite determined to tell me I’m wrong. So I’ll let you. I’m wrong! ?Going back to the OP's question, you usually can't lower the tailgate when hooked to a travel trailer.
You’re rightYou seem quite determined to tell me I’m wrong. So I’ll let you. I’m wrong! ?

It depends on the trailer. Many trailers have bumpers that are not designed for loads such as bikes (especially eBikes). Our trailer has a warning sticker that attaching any non-factory accessory to the bumper voids the frame warranty.Is it not an option to mount a hitch receiver to the rear of the trailer?
Most travel trailers don't have a hitch receiver (frame mounted) and rather put a hitch receiver on the rear bumper - which won't support the weight of two eBikes. Most recommend not putting anything over 50lbs on these. They are typically 4" square light gauge hollow aluminum tube - not good for much other than storing the "stinky slinky".Is it not an option to mount a hitch receiver to the rear of the trailer?
See my reply at the bottom.Is it not an option to mount a hitch receiver to the rear of the trailer?