I use a 15gal tank for the 3-4 times a year we go to campfrounds that dont have full services. We always try to get full service but like I said there are a few spots that we go to meet friends that don't have em.
Anyway, I attach my tank to the trailgator on the back of my mountain bike. Trailgator is one of those things that you attach a kids bike and it lifts their front tire off the ground when they get tired. All I had to do to attach it was to clock the attachment of the u bolts that normally attach to the front of the bike fork neck and it attached to the handle of the tot tank. Now i just ride up to the backof the truck pull out the tank and clip it to the tongue on the bike and ride over to the back of the trailer, unclip lay the tank down. I made a short section of hose about 2' long attach to ttrailer dump vavle and fill tank. Take a nice easy ride over to the dump station and dump it out. Simple. Never has taken more than 10 min to dump (that sounds a bit wierd I will admit)
Pulls great behing the bike but one CG has gravel roads and some bigger air filled tires on the tank would do better there. The trailgator attached to the bike just under the seat post and that's where it turns from.
"Just like a 5er!!" Ok... its a bit more smelly though
Mark