The website could provide a bit more info; at least for the GL1800 conversion.
Is it IRS? Their literature says semi independent. From working on mine it appears to be rigid. However it does ride pretty nice.
Does it include EZ steer? The Eurowing has an entirely new front end that sports a car tire. It is VERY responsive and easy to stear.
Available in kit form since there are so few dealers? They do not offer the trike in kit form.
Cost?
The price is pretty much in line with other trike kits excluding the front end. The front end was about $4,000 when we bought ours in '09.
Are the floorboards included? The floor boards are included. Be aware that they are a no-step floorboard.
Paint match included? On mine the paint was included.
Is there an aux gas tank kit available? To my knowledge there is not an aux tank available. However in 33K miles, it gets.only about one mpg less than our two wheeler.
Just basic stuff most all other manufacturers include would be helpful.