I did the 2x4 and tape nailed to the end trick with DW reading the "smart end" as well. 11 feet 10 inches to the front edge of my Coleman Mach III when hooked up.
BUT if the radio antenna is straight up, it will break the fluorescent bulbs and covers installed in 12 foot gas station canopies when you pull away.
Don't ask how I know.
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW