Ive been looking for a trailer to convert into a Mini Toyhauler for a while and came across this https://www.facebook.com/exploreNOBO/videos/580887599018171/?comment_id=2202535189999172¬if_id=15...No-Bo toyhauler on facebook.. It's not really as small as I wanted, but I like the 7' width for boondocking narrow roads. I'm not much for the mass produced laminated walls on the No Boundaries and prefer cargo trailer construction, but hey.. Finally a full feature toyhauler that's not huge.
You may want to look at the KZ Sportsman 18TH; Slightly smaller than Forest River but seems much more open plan. I don't like the kitchen layout in the Forest River - seems very claustrophobic and almost no counter space.
I have one and just returned from a 5,000 mile 5-week trip - the toy hauler was perfect for me. Esay to tow, super light and plenty of space for me.
You might be better off with a real enclosed trailer sized to your preference with some living quarters outfitted. You have a lot of flexibility if you are only hauling bikes. You might even want to look into side door model where you load the bike up from the passenger side.