It probably won't need much those old 200s are damn near impossible to kill. Get the water pump swapped have the carb cleaned and a new set of plugs and you should be good to go. Bills is one of the best repair shops I've dealt with in my years of pipelining definitely can't go wrong have them check it out. As far as building a skid goes I'd recommend against putting your leads on reels. They'll get hot enough to melt the rubber insulation on any high amperage welding I'd build a simple lead rack that you can swing out of the way at the tailgate of your truck.
I’m glad you told me, I came close to ordering a $400 reel set. Too bad, I’ve always thought they’d make things easy.