If the ROV (remotely operated vehicle) is not for use in water, the described sealing issues are not much of an issue.
zoomkat, here is the interesting thing, something that both you and possibly MichalPL, may or may not be aware of:
The term "ROV" is generally only applied to underwater, remotely operated vehicles.
The term "UAV" is applied only to remotely operated aircraft, eg "Unmanned Aerial (or Air) Vehicle".
The term "UGV" is applied only to remotely operated ground vehicles, eg "Unmanned Ground Vehicle".
In all of these cases, what typically separates them from a simple remote controlled vehicle (of any type or operating medium) is the addition of feedback (in the form of telemetry), in addition to the remote control aspect; sometimes the feedback may only be video, but in most cases it also consists of data about the operating environment, status of on-board systems, and other information like heading and speed.
These terms are well established in the industry; one would think that the term "ROV" could mean to refer to just about any "remote operated vehicle", but in the commercial sector (and military sector, I believe), the term is used specifically for remote underwater vehicles only. If another operating environment is intended, one of the other terms is utilized, or an explicit modifier term or phrase is used in addition to the term "ROV" (sometimes, you even see "Underwater ROV" - talk about confusing!).
Historically, such vehicles have also been termed as "telechirs" (the roots of which are greek, I believe; teleos, and chiro - I think - meaning something like "remote hand"), as well as "mobot" (which was actually a Hughes Aircraft trade name in the 1950s and 60s for remote manipulators used for remote manipulation of radioactive and other hazardous materials and/or environments).
