what is that thing at the back of the car?

Parachute !!

back to the future :) flux capacitor swallows any orgnaic compound for fusion reaction and interdiumensional travel.

However looking at the bulge on the bonnet suggest lack of room due to a big v engined donk and the rear houses the radiator, fans that also cool hydraulic lined underwear.

Ohhhhh never thought of a Time Bandit !! But if I had to guess... Ummm quad turbo Briggs N Stratton with Tomei pistons on methonal and stage 5 N2/O... Their was a 1200 coupe in the street behind me yrs ago , ran a leyland all alloy 3.5 didnt have scoop, it fitted under. Another in my area running VL 3.0L and has scoop.... Luv the pic though

Looks like wooden ramps on rear. Maybe camp stuff.

Front thought it was that thin Datsun metal folding in the wind

you forgot to mention bonnet scoop is just something in the background - dont spoil it! :))

looks like his wearing the same hat that Hannibal wore while talking to Clarice at the airport when he was waiting for the unsuspecting Chilton to unboard his plane... "Im having a friend for dinner"

I'm going with nickmitty - dragchute

Jerry cans.