...well, while we (& maybe the other 100+ who've read your post?
) don't have the same model, we do
have an older "Apex". Yours sure does have a super floor plan & it's especially great to have both
a sofa and a dinette. A great buying decision!! RE the sheets, I believe that we have always used "regular full size" for sofa/table "beds" on other campers we've had over the years. And, RE the Tacoma, with the full tow package it'll do the job...barely, however, according to lots of folks
. Just watch the additional loading that tends to sneak up with people and stuff in both the TV and trailer as it's easy to blow right by max load and max tow. On the other hand, the manufacturers have really stepped up in recent years to design/build very nice, well equipped RVs that are reasonably light and towable. You have a great example! Be safe and have fun!!