I echo Fishy's comments.
Might as well have given the cat a link to the plans for a smokehouse with a cement slab floor and two boxes one for cold smoking and one for hot smoking to smoke three whole hogs in at a time that you can get from cooperative extension.....it's great but it will set you back about $5-7K in materials and labor depend on what value you place on your time to build it.
Frank, I've lived a long time down south and have called two of the traditional BBQ capitals home and to suggest that if you're serious about smoking the only way to do it is through one of those high falootin trailers is funny, thanks for the chuckle. I'd be happy to introduce you to a few country boys that smoke whole hog out of oil drums that would put a lickin' on that tow behind contraption. I've had plenty of BBQ that kills it from a bullet smoker, I've also had great cue from an kimodo style smoker and damn near everything in between.
Uconn93, what do you want to spend? There are plenty of options available. Depends what and how much of it you want to smoke, heat shouldn't be an issue, it's consistent temp. that you are looking for. You want to be able to hold the temp. for a long time without jack assing around with the vents every 15 minutes it's BBQ, not grilling. When you find what works for you, then start experimenting with different rubs and woods as that is what imparts the flavor into your meat of choice.