Does this have not only have a bayonet style connection but also a threaded ring to retain the plug?

Yes plug in and then thread on the retainer ring

Whats the heaviest gauge wire that can be used for this?

Not sure of max size but I used 6 gauge with no issues

Can I install this upside down under the trailer instead of on the side?

You could...but don't think the seals, hinge, led light, etc...would hold up with much road spray & water from towing. The flip cover does have a pretty snug grip when closed.

Does this come with the 4 screws that you need to attach it to the rv?

No screws come with the unit. I used the same screws to install. It was a fairly easy install and I am not real good at this stuff. It is working great.

ASIN	B00BIK5W9A
Best Sellers Rank	#159,558 in Sporting Goods ( See Top 100 in Sporting Goods ) #9 in Boat Shore Power Adapters
Brand	Furrion
Customer Reviews	4.7 4.7 out of 5 stars (316)
Date First Available	26 June 2014
Item Weight	460 g
Item model number	F52INS-GS-AM
Manufacturer	Furrion
Manufacturer Part Number	F52INS-GS-AM
Model	F52INS-BS-AM
Product Dimensions	37.49 x 29.49 x 26.01 cm; 460 g

Furrion 50 Amp 125/250 Volt Shore Power Inlet with Marine Grade quality and PowerSmart technology (Black) - F52INS-BS-AM

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