Hi Gary,
We sold our rail, but still make the dunes now and again on the quads. The guy I fly for has a really nice blown LS1 powered buggy

Our outfit is based out of Yuma, but I take care of the country east of the Gila Mountains. My strip is about 25 miles east of Yuma on the north edge of the farm ground. I have pilots quarters on the strip you are welcome to anytime. Just give me a shout. There was a map of where everyone based out of, on this site at one time, and I think my strip was on it I can PM you the coordinates and particulars as well...
Ya the tandem factor of the -4 works for me for the same reasons, and I just can't swing the extra cash for an -8. I also need the pax seat, so the -3 is a no -go for me

I have flow a coulpes -6s and a -7 and liked them pretty well, but everything else I fly is "pilot centered" and stick driven, so I *think* I would prefer the -4
Rumor has it I will be attending a wedding at Gateway in the spring. Not exactly your backyard, but close, I will give you a shout if I do...
Take care, Rob