it's also not a bad idea to jump the keg to a clean keg before you drive it anywhere. Chill it down first and pull off a bit to get it flowing clear then a simple jump hose and transfer under pressure leaves all the trub and sediment behind.
I did the beer for a buddies wedding last summer and had 7 clean, transfered kegs to fill a 4 keg keezer. The clean kegs were kept on ice until one in the keezer kicked then I dropped the new keg in, pulled until it flowed and disco, we were back in business. I had magnetic "tents" describing each beer and just put it above the appropriate tap when I changed kegs.
It was super slick and I'm still hearing compliments about the beer and setup. Fun.
I'm drinking an Irish Stout out of the same keezer (now in my basement) right now.