To me, the difference is in turning corners--the fiver will track inside of the trailer and you really have to be conscious of curbs, signs and trees. Longer is worse on this. And, of course, where you can fit for an rv campsite...
And, welcome to the forum.
2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired