On the WDH issue, you mentioned two things that will make it a pain to manipulate your WDH, not straight and incline.
Make sure it's straight as possible, then when you're ready to unhook run the jack down and use it to slightly lift the tv and camper, just a few inches is all it needs. You'll find it much easier, I could actually hook and unhook my chains by hand without the pipe helping.
Once the bars are off just let the jack down until the load shifts enough to unlock the tongue and then unhook as normal.
Now-2014 Sierra 346RETS 5er BUB
Then-2002 Keystone Springdale 286RLDS TT
Nights camped in 2014-28, 2015-127, 2016-10