Choose this to convert the rear-end of any width trailer to an open porch area with steel floor. Add to your cart, then update quantity to how many feet for a porch you desire. Cost is per foot of porch and minimum is 4'. Note: This doesn't add any length to your trailer size purchased, it only converts length to an open porch. Reduces your inside box area by the size of the porch. Walk through rear entry door purchased separately if desired.