I pulled my Piggy on a 8,000 mile solo coast to coast trip I just completed. It was nice not having to cram and bungee stuff into and onto the bike. I put only those things I needed often or quickly in the saddle bags and trunk.
I made a 5-state trip (no co-rider) last summer and pulled the Bushtec for the entire 3,200 miles. I had 2 buddies with me so I carried my stuff (way too much) and their extra helmets and cold weather gear. I figure why not pull it. I'll be taking it to Ruidoso in a few weeks just for the convenience. It has a garment bag on the lid and I can pack a suitcase rather than having to stuff the soft bags into the bike's saddlebags and trunk.
Iam from Michigan and I am now in Independance California. My Bushtec has a folding bicycle, 12 x 12 canopy modified for windy days. Water purifier tripod barbeque grill folding chair firewood saw. I just can't get it all on the bike. I have been on the road for a month. All I have to do is unhitch the trailer when I want to travel the mountain roads.
I solo all t he time. Sure, the tent and air mattress and chair and cameras and laptop and....the list is endless, will fit on the bike but it is a PITA. The trailer keeps the stuff safe, out of sight of those up to no good. Drop it at the camp ground and do all my riding around town with no trailer. (unless I need firewood!)