Well, as usual I'm a little late to the party. Really jealous that you've managed to build your dream Expedition Camper.
I''m a KLR Guy too, so here's how I transport my bikes. My way is a little different than how you solved the problem.
I thought I'd share this to you and others who might want to transport their motorcycle behind their Adventure Vehicles in a unique way that gives you more cleanance and makes loading a breeze. You will find it interesting if nothing elsel
A little back story. Back in 1973 I worked in a small Factory that made motorcycle carriers. I am one not to pass up a good opportunity to learn some cool engineering. So I jumped at the chance to learn how Factory production worked.
As I worked there making these carriers I studied how they actually function outside the norm. And am still impressed that it didn't catch on any more than it did. Im my opinion it should have set the Industry Standard.
About 15 years ago I was wanting to built a bike carrier to put on the back of my 38" Class A Motorcoach. But still wanted to retain the ability to pull a Towed. (My Rock Crawler) And I remembered the Red Ant Motorcycle Carrier I built back in my early 20's.
I worked with Richard Chandler (The Inventor) and even helped fine tune the assembly line a little.
So in 2006 I set about to build my own Red Ant Carrier, only beefier. Plan was to buy a BMW GS1200 in the new future.
I ended up buying a 1200 XTCYAmaha Super Tenere in 2014, but rode my 2006 KLLR for years. Still ride in in fact.!
Here's the link to the Patent. And if you download the PGF file you can see the drawings. The only ting missing is the dimensions. But if you're a good Fabricator you'll find that part easy. Definitly download the drawings that are linked about 1/2 way down the page...
The specification discloses a carrier for carrying a motorcycle or the like on a motor vehicle and comprises two support arms adapted to be coupled to a motor vehicle for supporting a channel or rail
I built mine BEEFY! I used a 1" grade 8 bolt for the pivot pin, and all brackets are 1/4 inch steel. I made mine so that in the parked position it's 32 inches above the ground. But still will angle down 20 degrees at a 180 degree swing. Plus If needed I can add a short pice of extra ramp. I added an electric winch to mine so I can pull my motorcycles up the ramp and hold it in place against the wheel stop while I tie the bike down to the rail. Then that same winch line can be moved to the rail back up into the horizontal position.
I did add 2-2 inch reciever hitches to the frame ends of the coach, rather than a bolt on system iike the original design.
And did the same to the back of my pickup so I could use the carrier on the back of my short bed Dodge!
Long story short is, the right side of the rail is camped down in the carry position, but once unclamped the motorcycle rail can be swung out and pivoted on the left reciever bracket. As it rotates, it lowers the tip (right side rail) down at an angle.
The secret is the pin is angles at 10 degrees in stowed position. So a a 180 degree swing will give the rail 20 degrees of down angle. It's really slick.
It doesn't give you a big rear deck, like you have now, but does allow you to carry your bike up as high as you want to not kill your angle of approach. And like a said an extension ramp can give you more carried height. And with the winch on the wheel stop rolling a bike down a steep angle a lot simplier. Hint, I use a strap around the foot peg to raise and lower it with the winch line. My winch control is remote control too. So not hard to work it and hold the bike to guide it.