For use as a "house battery", I would recommend either the regular Deep Cycle, or the Marine Deep Cycle. Usually, the only difference between the two is that Marine batteries are usually built slightly better, but either should meet your needs for a trailer battery.
Any battery marked as a "starting
" battery will give you a good shot of high amperage, which for engine starter motors is a good thing. This is also defined as CCA, or Cold Cranking Amperage
. CCA is not a useful measurement for "house batteries" because house batteries aren't generally used for starting vehicles, but only used as a "storage container" for electro-chemical potential, or simply stated, their ability to produce electrical
current. (A battery doesn't actually store electricity per se, but creates electrical
current through chemical decomposition internally, which in turn, produces free electrons). Starting batteries are not the best choice for a house battery because they generally have a higher CCA rating, but a lower Ah (Amp-hour) rating
The Ah rating
is a way of measuring the battery's ability to provide a given amount of current (amperage) for a given amount of time. The higher the Ah rating a battery has, the more electricity it will be able to produce
Example: If a battery claims to have a 1200 Ah rating, it will provide you with either 1200 Amps for 1 hour, or 120 Amps for 10 hours, or 12 Amps for 100 hours. Obviously, the amount of current available for you to use will be directly proportional to the rate at which you are using it. Also, I would also like to point out that a battery should never be discharged below 50% of its rated capacity, because to do so will damage the internal plates of the battery and greatly shorten its life.
As far as "sealed" versus "wet cell" batteries go, that is strictly a matter of personal choice. Wet cell types are generally a little cheaper, and tend to be a bit more forgiving to rough useage. Some prefer Sealed batteries for ease of maintenance (actually, they are also referred to as "mainenance-free" batteries, but this is a misnomer since all batteries must be maintained by proper charging, and the avoidance of overcharging or over discharging. My personal preference is toward standard "Wet cell" types, having not had very good experiences with "sealed cell" types, but it's your decision.
Hope this helps you in your decision.