Lazy jacks are control lines that keep the main sail bunched up on top of the boom. An alternative is the Dutcheman (brand name) sail flaking system. Neither lazy jacks or the Dutchman would be standard on a Rhodes 19 and really not necessary.
It is a good thing for you to experiment to see what each sail does independently of each other. As you found out using the jib alone is ok for going down wind but not for heading up wind. I'd suggest that the only times you would want to use only 1 sail at a time would be when heading down wind you can use the jib alone, when the wind is really blowing you might just use the main sail but (as pointed out) you would make very slow progress to windward without the jib used in concert.
Glad you had a WOO-HOO moment.
I've sailed on a Mariner 19' (basically the same boat) in about 20 - 25 knots of wind many moons ago on the Rapahonnac River near Deltaville, VA. 'Twas quite an interesting ride. At times like this you will wish that your main sail had reefing points.
Great trailer sailor too.
"The cure for anything is salt water~ sweat, tears, or the sea." ~Isak Denesen
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