Not trying to beat the horse here, but everyone has already told you what you need to know. Now your husband may read this, start looking around at other forums, and decide that the sequoia can do the job. A wdh here, a little modification there, and your all set. As part of the been there done that crowd, my suggestion would be not to go a route that takes you down that path, unless you can afford to replace the tow vehicle with something different.
Your budget is a bit low for newer stuff. Not that you can't find a decent TT with that budget, I think you can. The issue is that the older it is, it may not be as "lightweight" as newer trailers. Which drives the tow vehicle issue.
Case in point. Thought with a WDH and some upgrades wifes truck could do the job. Bought TT and went on short trip (40 miles round trip, flat roads, 50 mph speed limits). Everything was beautiful. Second trip out loaded up with the kids for a longer trip (250 miles one way). Was the polar opposite of the first trip. Made it, had to avoid most highways at all costs, same thing on way home. Had a great time when there.
A week later I sold my car for a truck bigger than my wifes. Now we have been to Nashville, Niagara Falls, Ohio multiple times, etc. We could have still used the wifes truck, but we would have been pretty stuck to short local campgrounds or I simply wouldn't do it.
Not to burst the bubble, but just to give you some insight into actual situations. Don't be swayed by all those signs at the shows showing how a ford explorer or similar sized vehicle can pull this or that. Go by the numbers, exaggerate the size of the tow vehicle (a bigger one than needed is almost always better), and you should do alright. And listen to these guys here, they know what they speak of. :)
Good luck!!!