i built a 225" fed and wish i would of built an altered for a few reasons. first, takes up less room in shop and trailer. second, its a multipurpose rig.. you can run more types of class racing. an example is you can run nostalgia if you want one weekend and go run with RED's or door cars. lastly, the FED is a pita to deal with but i think a RED would be easier as you can run with one person if need be and so can an altered. my trailer is 28' and 26' on the deck as i have front cabinents. i have about 4" of room on each end. i shove the front over against the wall and i can drive the golf car in beside it with a few inches of room on both sides.