If the a-frame jack you have on your trailer failed I recommend getting a stronger jack for your 2013 Springdale trailer. I recommend the Bulldog Powered Drive Trailer Jack, part # BD500199. This has a 4,000-lb capacity and a total travel of 22-inches. You may also want to keep a cover on the jack when it is not being used if you do not already have one. I recommend a cover like part # UF38-944020. This weatherproof cover has a drawstring that helps hold it secure to the jack.
The etrailer.com Electric Jack w/ Footplate - Drop Leg - A-Frame - 25-1/8" Lift - 3,500 lbs - Black, # EJ-3520-BBX, comes with a 1 year warranty on parts. It is designed to be water resistant with its zinc coating and plastic housing, but you could put a cover on it if you desire like the Ultra-Fab Protective Cover for Electric A-Frame Jacks - Vinyl - 12" x 14-1/2", # UF38-944020, to prolong the life of the jack.
We highly recommend getting yourself an electric trailer jack. Marshall has always had one on his Lance, and Kelly just recently got our #1 recommended Husky electric jack after almost three years living with a manual jack, and she couldn't be happier. For Kelly, it was one of those "Why didn't I do this a long time ago" reactions. Oh well, nothing like living in the present and not bitching a fit every time you have to hook up! No more worries about Kelly's back going out because of her jack. Her back is jacked, but her back won't go out due to a jack. Something like that. 
This custom-fit mount lets you secure your Hi-Lift jack to the passenger's side of your Jeep. The jack mount lock codes to your ignition key. Automotive-grade, weather-resistant black powder of keys - for your hitch lock and coupler lock, your pickup cover or trailer door, and all the various padlocks securing your equipment? Tired of fumbling for the right key or having to replace a lost key?
The best jack is extremely relative, and is dependent on many factors. The Etrailer.com Electric Jack w/ Footplate - A-Frame - 25-1/8" Lift - 3.5K - Black # EJ-3520-BBX will work very well for your 3500 lb dry weight travel trailer and has an excellent price point for this type of jack. It includes a 5-5/8 inch inch drop leg to allow faster extension and retraction and utilizes 2 switches for function; one for power and one for raising or lowering the jack. It also has LED lights to...
After what seemed like a hundred cranks, your trailer is lifted enough to attach the hitch to your truck, but your arm feels ready to fall off. An electric trailer jack can save your arm by lifting your trailer hitch with just the touch of a button. Most electric jacks use 12V power, so you can hook them up to a battery while you are out on the go and not worry about finding an outlet. Most models also include a manual jack handle as well so you can still lift the trailer, even if your battery runs out of power. The Barker electric trailer jack is a commonly found option, and the VIP 3500 can handle most campers and travel trailers, as it is rated to lift up to 3,500 lbs. This model lifts trailers up to 18 inches, so you can easily attach your trailer to your truck or SUV. There are many electric trailer jack options available with many lift capabilities, and with the large inventory available on eBay, you can lift your trailer with the touch of a button in no time.
The Odssey series of electric tongue jacks is the only one that comes with an emergency ratchet style crank socket allowing for easy cranking even if the propane tanks are close behind.* Emergency ratchet style crank socket* Water resistant switches* 18 inch of travel* Easy bolt on installation* Powder coated finish resists rusting.* Extra large adjustable footpad for 4,000 pound unit* Hardened all steel gears Die-cast aluminum cap* Large front light for easy night time viewing* 2 1/4 inch outer tube on 4,000 pound unit.4,000 black.
From my research I found that your 16-ft Airstream Bambi has an A-frame. I recommend the Husky Brute Electric Trailer jack, part # HT87247. This jack features a 6-inch drop leg and lift of 18 inches so the total travel is 24 inches. This also includes a manual override if needed. This is a bolt-on installation. To keep the jack protected from the elements over prolonged periods of time I recommend part # UF38-944020.

EXCELLENT QUALITY 100% Solution Dyed Polyester means Sun-DURA® colors are part of the polyester fiber itself, rather than the dye adhering only to the surface of the fibers. 7oz. marine grade polyester that offers superior resistance to harmful UV rays, fading, mildew, tearing and overall wear-and-tear. Our own unique finish provides exceptional water repellency while maintaining breath-ability for the health of the electric jack components. Made in USA 

For a cover to use on the Bulldog Powered Drive Trailer Jack # BD500199 referenced in your question, I recommend the Ultra-Fab Protective Cover for Electric A-Frame Jacks # UF38-944020. This will easily slip over the jack and can be secured using the drawstring. This cover measures 12 inches x 14-1/2 inches. I have attached a video demonstration of the cover for you to check out.
A 3500 lbs electric tongue jack would be a good fit for your 6200 lbs 2006 Gulfstream Cavalier travel trailer. Based on your trailer weighing 7000 pounds loaded you will have an approximate tongue weight of 700 pounds. I would recommend the Stromberg Carlson # JET-3555 (white) or # JET-3755 (black) as they are rated at 3,500 lbs. I have also included an FAQ for you too. One item I highly recommend is the Ultra-Fab Protective Cover # UF38-944020. With the electric jack being out in the...
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This custom-fit mount lets you secure your Hi-Lift jack to the passenger's side of your Jeep. The jack mount lock codes to your ignition key. Automotive-grade, weather-resistant black powder of keys - for your hitch lock and coupler lock, your pickup cover or trailer door, and all the various padlocks securing your equipment? Tired of fumbling for the right key or having to replace a lost key?
Law enforcement agencies generally support the Taser as a worthy tool that protects officers from violent offenders and protects the suspects as well. According to Taser International, founded in 1993, which markets products based on Mr. Cover’s original invention, more than 13,400 law enforcement agencies around the world now use Tasers. More than 375,000 individual officers have them, and so do more than 181,000 private citizens.
We highly recommend getting yourself an electric trailer jack. Marshall has always had one on his Lance, and Kelly just recently got our #1 recommended Husky electric jack after almost three years living with a manual jack, and she couldn't be happier. For Kelly, it was one of those "Why didn't I do this a long time ago" reactions. Oh well, nothing like living in the present and not bitching a fit every time you have to hook up! No more worries about Kelly's back going out because of her jack. Her back is jacked, but her back won't go out due to a jack. Something like that. 
The cover has worked great. The reason for only 4 stars is that we took preventative measures when it arrived. Many reviews complained about it leaking. We turned it inside out and sealed all the seams. Once dry, we put a plastic bag on first and then this cover. Using both has made a water/weather proof cover to protect the electronics of our power lift. The plastic on its own is not strong enough, adding this cover made the difference.
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