You want a good, cheap, easy to use loader then have a look at
http://www.rackandroll.net.au/ then go out and get the following items and make your own
1 standard steel tent pole
1 standard steel tent pole with a spreader bar end ( flat with a hole in it)
1 pool noodle
6 or 8 heavy duty cable ties
6 light cable ties
1 chair
2 stubbies
Step 1/
secure the female end of 1 of the poles to your front roof rack bar using the heavy duty cable ties, leaving the end with the locking bolt flush with the end of the rack on the passenger side ( make sure you can screw the locking bolt in and out)
Step 2/
Slice the pool noodle in half length wise, then slice out a "V" length wise in each half to fit a tent pole in
Step 3/
Attach the pool noodle to the spreader bar end with the light cable ties. Leave about 100mm of the pole exposed at the round end
Step 4/
Insert male end of spreader bar into the pole attached to the roof rack and do up the lock bolt finger tight
Step 5/
Insert pin on the standard tent pole into the spreader bar, adjust length of upright pole so that it's just supporting the spreader bar
Step 6/ Sit on chair, open stubbie and admire your $30.00 kayak side loader
I load a Hobie Revo 13 on my own onto the Jackaroo and it's a piece of cake,not quite 1 handed, but close

