. 
Carrying external loads on fixed wing aircraft!!!
1) Carrying
External Loads Risks
2)Carriage
of External Loads
2) Carriage
of Passengers and External Loads
3) Airplane
External Loads, Paddlers Information
4) Words
of caution about what you strap to the floats
. 
Snowmobile about to be tied on the float of a DHC-2
Pilot glancing out to check on a Skandic ski-doo tied to the float.
O.K. Now how are you going to tie the darn thing on there?
Links about knots
Selection of knots for outdoor use
includes
Truckers hitch
and other animated knots
The knot site on real knots in
rope.
Fort St James Search and Rescue
. 
Dhc-2 MK II loaded up with enough lumber to build a small cabin
Note 4' X 4' pieces of plywood loaded inside