Another thing is to rent on. . and also go to a RV show. now Dealers will wheel and deal ya but most RV's you can tell the quality. . stay away from stapled cabinets. . look for quality fit and finish. metal glide drawers and such. . most of the quality stuff will be on 5th wheels but some are on TT.
I had a 28' Desert fox. this is a TT toy-hauler. . you drive the quad in the back of it. the dinette and couch fold up. there is usually depending model, a motorized bed the comes down from the ceiling so sleeping 4 no problem. . the couch and dinette also make to a bed so 6 or more depending on child or adult.
See you live in Ca. . . One of the things you might consider is the insulation quality. my Desert fox did pretty well. It as other toy-haulers do, had a built in Generator so it was able to run the micro and A/C as well as a 30 gal. Gas tank for the Gen and a fueling pump to gas up the toys.
If you get anything near a 28' , 10-12K trailer, I would highly recommend the Hensley hitch. . for about 10% of the cost of the trailer, I had piece of mind in knowing the TT was secure and would have
NO sway. . it has a built in weight distribution where you don't have to remove the bars every time. . stays on the trailer... just undo a draw bar. . (the green bar in front on the picture. ). . the pivot system makes the TT feel like a 5th wheel.
Trailer Sway Elimination Guaranteed - Hensley® the ONLY trailer hitch guaranteed to totally eliminate trailer sway.
Here is a few pics of the parts. .
New 2005 Hensley Arrow Hitch pictures from world travel photos on webshots
Now, as you have a quad, I recommend a toyhauler and in my opinion, the desert fox and others like it are wonderful... . they have the toy fueling station and usually have a built in Gen... The only drawback to having a TT where the dinette and couch fold up for the quad verses a 5th wheel with separate wall is you cant use the trailer in-route to the destination for like lunch break or whatever... Also diidn't have as much storage space. . all of it was in the back by the rear door.
Below is a few pics of my 2 trailers I have had. . the second one I have now is a 36' Raptor toyhauler 5th wheel made by Keystone... I originally had a shell on the truck and got the TT. but with the practicality of the toy-hauling, the 5th wheel with the separate wall was the way to go. . much more storage, liquid capacities. . and convenience. you see the last one with the 2 quads in it. . very cramped. cant do lunch in it on the way. .
If you don't want the toy hauler. . I would agree with the Arctic fox as a good regular travel trailer. . But again go to a RV show and look around. . there are numerous models with bunk beds, . . outside mini kitchens, etc. After you find a good trailer, DO, look at the tire situation and add up the weights on the tires and see if they add to more than the GVW of the trailer. . not, just above the unloaded weight. . also see if they are a tire of quality. . not china made.
Hope this helps you in deciding. . if you have a quad, I'd get a toyhauler. . the TT was able to fit 2 in it. . see pic. . . . Good luck and let us know what you decide to get.