Having one installed next week. They say 11 foot wall height will give me at least 14 foot center height, or more depending on how it's leveled. Twenty wide by 40 long is going to run $2,900 installed, all taxes and labor included. Might be cheaper elsewhere but I've looked at three of their installations and all the owners highly recommend this dealer (local). Was told that each additional foot of length would run about $80.
Just drive around till you see some and ask the owner who did the work and would they recommend them.
At some point during every day you suddenly realize nothing else productive is going to happen the rest of that day. For me, it usually occurs around 9 am.
Vengeance 25V (the Harley needed a home)