Yep. I also noticed that your trailers were slightly heavier and longer than the one I am considering, but you are running heavier-duty springs and/or air bags...which led to my original question (lighter, shorter trailer w/stock LC). I really like how the stock LC rides so didn’t want to stiffen the springs, and didn’t want to introduce the complexities of air bags. That, plus one of my favorite campgrounds limits hookup sites to 24’ - and the Lance 1985 is 23’ 3”. And yes, they measure and are very strict.
I towed the first year on stock suspension. I had a 20' (24' including hitch) trailer that was 5000# with about a 650# tongue weight with battery and propane and all my stuff loaded in it. My WD hitch was really undersized (550# max) and when I maxed it out it was really stiff, which is why I relied partly on the air bags to help make up about an inch of the rear end sag.
With a properly set up WD hitch, you'll be fine. The right sized WD hitch will get your front back to the original height and your rear within ~1" of stock height (assuming no other load in your trunk). Since the LC has about 1" of rake, you should be almost perfectly level, maybe 1/2 to 1" low in the rear when loaded down. Getting the WD right is key. TW of the 1985 is listed at 550#. Listed TW of the 2185 (what I have) is 755# and when I weighed mine with 2 full propane cylinders plus a group 27 100Ah battery it came in about 770#. I'd recommend a WD hitch that's rated for 750-800#, though you could potentially go higher. In any case it's generally better to have too much WD available than too little (though far too much can make your ride bouncy). Everyone has their own opinion of which WD hitch is best, but in generally any of the $450-600 options (BlueOx, Fastway, Equalizer, etc) are probably all similar. Avoid a WD setup that uses a separate friction anti-sway control.
You'll want to limit towing to 6th gear (your 2017 is an 8 speed, unlike my 2013 which is a 6 speed). In the mountains you'll want to use 4th or 5th for sure. On my 6 speed I run in 4th normally, will drop down into 3rd on grades up or down hill, and occasionally 2nd on a steep downhill or a mountain pass where I can't maintain speed in 3rd.
If you haven't bought a TW scale yet PM sandroad - he has one that he may be willing to lend you for a few days. Then again they're about $120 new, IIRC so shipping it around might be expensive enough that you just want your own.
Side note: As to your length requirement, I have 350W of solar panels on my Lance 2185 and half the time we camp now we don't use hookup sites. The non-electric sites are often nicer and quieter (and cheaper) and some parks don't even have electric (especially out west). We can run a few days on the battery, even with running the heat occasionally at night - the only thing we lose is the ability to flip on the AC for a bit when we're somewhere super hot (like Moab). That said I had a similar length requirement as I have to negotiate a tight alley turn to get my trailer parked, which prevented me from looking at 28'+ trailers and ended up channeling me to the Lance 2185 which was 25'8".
