I'll go through your list with our 2005 Bigfoot
model 25B25RQ as reference; the 25B21FB or 25B21RB would be similar everything would be smaller and less separation
Here's our "must haves"...
easy to tow (open to a fifth wheel or tow behind)
---- It's a dream to tow
Under 24' total length (not body length)-
-the interior length is 21", the entire length with bumper and tongue is 25'6". We tow with a F-150 v6 Ecoboost.
full bath - wet or dry---
-- Not only is it dry but the bathroom is large and has a beautiful large skylight as a ceiling in the shower! Bathroom cabinets above and below.
60" bed (ideally 80" long) (bigger is fine)
-----We put a queen topper 60 x 80 on ours OVER the 60 x 74 mattress and didn't get around to cutting it to fit for almost a year. The topper just slumped down at the end but you could pull the mattress out a little from the wall at the head and split the difference.
access to bed WITHOUT climbing over each other (side access). ------ The bed is completely walk around, even with the mattress topper not trimmed. Eventually we trimmed the extra 6" since my husband is 5'7" and I'm 5'3".
some sort of separation from the bed and the main living space...hubby gets up early (4:30 often) and I sleep in. A curtain is enough, but the further the better
------There is a complete separation of the true floor to ceiling bedroom from the rest of the trailer. Side tables with counters and cabinets above. Lift up bed and full storage under the bed too! We have a soft accordion door for privacy that can be closed. All the shades are day-night also so they do block out light
Here's our "would like to have"...
solar or solar potential
---- our trailer has 2 170 watt panels and there is still room for more in addition to the AC, 2 Fantastic fans one in bedroom and one in bathroom, 2 large skylights, walkable roof with built in ladder and roof rack.
Lots of windows/light-
---One of my favorite thing about the trailer! 180 degree views from the front dinette and rear bedroom.TWO large skylights flood the bath and main living area with light
. Main area has a pleated shade to cover when light
not desired. Window over the kitchen sink and in the door too!
--much larger dinette than our Scamp 16. full storage under each bench in addition to storage behind one side and extra lower cabinet and upper cabinets.
insulation to allow late fall/early spring camping
is by far and away the best insulated true 4 season camper. You can use it in the snow! Heated underbelly, ducted furnace
, double pane thermal windows
, antireflective dark windows
, 1.5" foam core insulation.
The extra height and width are truly amazing in how large and spacious it feels inside. I like my kitchen, with oven, 3 burner stove, microwave
, double sinks and large refrigerator
with a separate freezer. Having 45 gallon fresh, gray and black tanks and 2 30# propane
tanks along with solar
allow us the ability to dry camp for a LONG TIME!
Used trailers in this model are now running in the mid 20's for trailers from years 2000-2010. mid 30's to low 40's for 2010-2015. MRSP is in the low 60's but people generally get discounts from related dealers and pay in the low 50's for new. Prices differ where you are in the country. Many will drive a long way to buy them and they sell within a day or two!
Good luck in your search! We are retiring in 5 years and plan to use our trailer for seeing the country too!