Yes! The Stromberg Carlson Electric Trailer Jack # JET-3755 is compatible with the Lippert # LC429756 that you referenced and it does measure the 8-1/2" when retracted. You could potentially use a caster wheel like part # PS1400750340 but this would cut your tongue weight from 3,500 lbs down to 1,200 lbs. All of our caster and wheel sets have a much lower weight rating so to retain the 3,500 lb tongue weight rating you will need to keep the foot pad. I recommend using the Ultra-Fab...
10" Tall x 80" long combo ramps can be used to lift your vehicle for service, load it onto a trailer, or display it at a show. The 8.5 degree angle of approach is perfect vehicle Remove incline section for maximum access and unobstructed view of vehicle's undercarriage Replaces heavy jacks and cumbersome jackstands Trailer loading configuration helps you safely load

Yes! The Stromberg Carlson Electric Trailer Jack # JET-3755 is compatible with the Lippert # LC429756 that you referenced and it does measure the 8-1/2" when retracted. You could potentially use a caster wheel like part # PS1400750340 but this would cut your tongue weight from 3,500 lbs down to 1,200 lbs. All of our caster and wheel sets have a much lower weight rating so to retain the 3,500 lb tongue weight rating you will need to keep the foot pad. I recommend using the Ultra-Fab...
Use this electric tongue jack to lift your trailer with the flip of a switch. The sturdy steel jack can handle up to 3,500 lbs. It has 19" of travel and a 5" drop leg for extra lift. LED Features: Electric jack with 12V motor lets you lift and lower your A-frame trailer quickly and easily Top-mounted toggle switches are easily accessible Large LED side lights make it simple to set
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 Fastway Flip trailer jack foot is an easily installed foot that will give you either a 4" or a 6" extension. It has a unique feature in that it will automatically drop down when you are lowering your jack and it will automatically retract into a stowed position as you are running your jack up. Either extension length fits the standard 2 1/4" tongue jack with a 2" inner tube diameter.
If a trailer didn't have a trailer jack, this means of transport would be pretty much useless – unless you are strong enough to lift it by hands or hitch (unhitch) a tow vehicle somehow else. Jacks can be manual and electric. With the help of an electric jack, you can hitch up substantially easier than with the manual unit, since a manual jack requires the application of physical force. Anyway, whatever the trailer jack you have, this part has to be completely workable and sufficiently reliable to prevent troubles during a journey under various conditions.

There are literally dozens of manual trailer jacks available. This is a very simple device that doesn't cost a lot of money. There aren't huge differences between the different available options, so we picked a light duty and a heavy duty manual jack option to give you an idea of what is out there. The manual trailer jacks we chose get good reviews on Amazon and are great choices if you wish to go the manual route.
This fits nicely on our travel trailer power jack. We purchased it to stop the sun fading the black jack. Although we purchased and started using this a couple months ago, after days of heavy rain here recently we thought it would be prudent to check under it today. Yes, it is not waterproof BUT it was only damp under there and all the electronics still worked so we were happy. Let's face it, the manufacturers make the jacks to be weatherproof so a bit of water/damp should not hurt them. I do like another reviewer's idea of putting a plastic bag on first and then putting this cover on top though. A great idea!
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