Do you want to ride or spend a lot of money?  You can Trike a Burgman for less than half the price of a Goldwing trike.  See T&C Cyclestuff's trike kits for cost of trike kit.  Then pick a Burgy up for $6 - 7K, get a good guy to put the kit on for $250-450.  Ken Balmer in Franklin, NC did mine, took him one morning.  Everyone carps about scams on trikes.  You can have a trike for under $10,000, just not a Goldwing.  Type in Trike Kits, and look at the 12" Tow Pac.  It fits several bike types.  

Of course, if you'd rather, just go ahead and spend a whole lot of money.