maybe I wasn't very clear, but airing down=softer ride. Running low air pressure allows the tire to conform around any small bumps or rocks so the suspension doesn't have to take the hit. This I think would be a important factor for a off road teardrop. not to make a huge issue of this, no...
just to through this out there, the #1 reason I run bigger tires on my rig is to have the ability to air down normally 10psi or less and soften up the ride. I noticed a big difference in ride when going to up to 35'' tall tires. This would work the same on a trailer. Let the tires do all the work.
Solar panel
http://www.4lots.com/5wattunbreakablesolarmodulehugesale.aspx
I've been using one of these for over three years now and its holding up great, just give them a call and they can help you select the correct size for your application
Thats pretty much what I have gathered in my searching.
I have been in touch with Slee and he says Its a shot in the dark using LC springs. With custom springs it seems to be a shot it the dark as well. If the slee springs didn't work out I could always sell them, where I might have a hard time...