No one's chimed in yet, so I'll just mention that I've hauled a couple dirtbikes without too much trouble.
My el-cheapo ramp is less than 5' long, but my driveway is uphill from the street so if I put the Av's rear tires in the gutter, the angle isn't too bad and I can push my bike right in. For unloading at our riding spot, I look for a little hill and back up against it. If it's flat, I get a buddy and we wrestle the bikes in/out.
For securing, I just use two high quality motorcycle straps from the bars down to the anchor points at the front of the bed. If I had a street bike, I'd probably anchor the passenger pegs to the rear anchor points.
trash - at 400 lbs., you shouldn't have too much trouble hauling your bike around. Just get a looooooong ramp so the breakover angle at the top isn't too severe. The March issue of Dirt Rider magazine listed a few different ramp types and costs.
Transformer - is your Dyna Glide really 800 lbs.? Wow, do you think the tailgate would support that? Maybe you were thinking of removing the tailgate, but that poses another problem...
One problem I have that you don't see in the ads is that with the midgate down, I can wheel the front of my bike into the cab like they show, but when the headlight hits the roof, there's still about three inches of the rear tire left sticking out so I can't close the tailgate. I have a bed extender (which I need to modify), so it isn't that big a deal, I guess.
I posted some pics on the forum... maybe here, maybe in the accessories section? Let me know if you can't find them with a search.
Here's an awesome ramp that would suit both your needs (you don't want to know the price):
http://www.motorcycleramps.com