Hi guys, thought I'd replyBizzarre regardless that you have decided to builf your own.
I've considered building my own teardrop also. Lets look at some negatives about them first.
You cant get dressed inside the van unless you get dressed lying down. Fixed with an annex or shower tent. so factor that cost and plan in.
The best feature of the teardrop is areodynamics. But that wont help much behind a dual cab or Kombi. Teardrops weigh a lot for how large they are. The lightest is a "little boy" and that is around 320 kgms tare. And its too small. Cooking at the back lift up lid is open to the elements unless you design an awning. The Gidget is a nice concept with its sliding cabin to enlarge the living space but you are still only lying down and they arent cheap. And likely not easy to make.
The positives are there though. You can make one yourself. They can have a large bed area. TV and radio can be mounted above you on a cross member at the top of the kitchette area. You can have a water tank at the back underneath as the teardrops are often front heavy.
Use light materials. Multipanel isnt cheap but it can be drilled, moulded, waterproof etc
www.multipanel.com.au
My recommendations: Make sure you have a triple drawbar, two from the front of the leaf springs and one centre one through the middle. Forget one large drawbar only....mine broke completely off my small van and lucky insurance covered it. . Make the drawbar 400mm longer than normal. This will allow for a good sized trunk on the drawbar that can hold items like a porta potti and fridge, locked away. Under the floor via a hatch install a dry call battery. We have a 28 A/h only but it runs our Waeco fridge for 2 days (turned off overnight). The battery is charged prior to any w/end away with the car but on our trike we have a solonoid system so it can charge up when driving. This means that the trike battery runs down adding additional power until about 11.5 volts is reached then shuts off allowing for starting of the trike easy still. Worth it. We ahte buying ice.
So we initially had an "outback camper trailer" purchased for around $5000 new. It was ok and weighed around 340kgms tare. However we werent happy with the restriction in getting to the cargo under the bed. Then we bought a ChevronRV "Guppy" van. Very small caravan weighing 460kgms tare. A little clostrophobic and too heavy for our trike. Finally January this year we made the best decision ever to purchase a Detour camper trailer. This was after mcuh investigation as some camper trailers are pure hell to put up.. Remember legally I can only tow 300kgms GVM with our trike. The Detour weighs 185kgms tare (with the longer drawbar), has- lift up bed for great access, tailgate for even more access, queen bed and takes 2 minutes to set up (not including annex). The poly trunk on the drawbar fits the porta potti and CF17 Waeco fridge (this fridge is highly recommended). We have a shower tent, 20 litre water container on the rear tailgate. Tows as if it wasnt there. And has brakes. This is actually a motorcycle camper trailer so is very compact. Detour have a video on how fast it is erected.
http://detourcampers.com/motorcycle.htm Cost aunder 7 grand. plus annex.
Back on your teardrop Binner. Standard caravan water tanks are 55 litre and cheap at $70. Mount it under the floor at the back next to dry cell battery.. Pumps arent needed, have a plastic tap potruding out the back at the kitchen. We make do with a single gas element stove with pressure pack gas. Steamer for vegies. Toast mesh type grill. Square bucket for dishes, All saves room for shoes and other stuff. Centre drawbar carries electric wiring. Dolly wheel is essential. Height of teardrop should be 190cm or more to allow for awning height if awning is to be attached to side of van. You might need good vent on the roof, they get hot during the day. There are some nice cheap chrome 12 volt fans around. Wire in several 12 volt sockets and fuse block. I think you can get flexible solar panels now for your roof if so inclined to help with that battery. Tow bar lock needed. Spare wheel? Well not if weight and room is an issue. Pressure pack puncture stuff is good.
End of rant. tony