I went camping last autumn. It was too cold to sleep outside in the tent. I folded seats down, moved front seats all the way forward, and inflated full size mattress in the back. It fitted snug but it fitted There is no room left anywhere but some at front seats. I'm 5'9" 155lbs and my girlfriend is 5'5" and 120lbs and we slept OK in there. There is lots of space in the back of ML. I do some electrical work for living and carry all my tools in the back and have sealed 12" subwoofer box behind the seat as well. Everything fits without obstructing rear window. There is more space than newest Lexus RX400h.

Cheers,
Victor

__________________
1999 ML430 Silver 135k ml
Smoked LED taillights, Alpine in-dash DVD player, 12" sub, Pioneer components, 2 amps, 4200k HIDs, ML55 headlights, 20" rims, mirror LED blinkers

SOLD. 1996 E320 145k ml. Burgundy

SOLD but miss it everyday 1992 500sel Black
Chime buzzer mod,Alpine CD/MP3 player with stock amp,Euro headlights,S600 grill,20" rims, BEST CAR EVER!

SOLD. 1990 300E White
187k ml,smoked tails,Euro headlights,17rims,Intake,12" sub in first aid kit,alarm/autostart,buzzer mod