SpecRacer ....i too have had the same question and have done a lot of looking at other units while at the dunes. i have found nothing made in indiana that is for larger toys like sxs's or sand rails. here is what i have come up with. i do not know your wants or needs but have a decent idea. i do not know your physical condition but if you can crawl into your toy , imo, then you don't need a walk around bed. i don't know the track width of your toy but i do know my sand rail is 80" wide in the front, 88" track width rear, 13' 2" long and weighs 1960 lbs wet fresh off the sand. based on those dimensions and the fact that i don't need a separate garage, solely because i keep mine maintained and rubber band a paper towel and bag over my fuel tank vent.
with that said...... lakota builds one of the best, imo, but only offers an 8' wide model that doesn't work for myself. they will customize far more than one thinks. they build horse trailers but offer a toyhauler line. the benefit to that is that they are built to handle lots of weight, are all aluminum and built to travel off pavement plus hold there re-sale value. you can search youtube for lakota horse trailers with living quarters and know, all those models are offered in a toyhaulers with an open floor plan or separate garage of your size. you do have to take 2 steps on your knees into bed but no big deal imo.
https://youtu.be/VZWCzPAVUs4
merhow supposedly offers a 102" wide model but haven't heard back to confirm that yet. again specialize in horse trailers but offer toyhauler models as well. not as nice as lakota imo but hey that's just my opinion!
https://youtu.be/9esXHEJFr_A
sundowner also make a few nice models of toyhaulers that are 102" wide.
https://youtu.be/MszHg-NvLdE
also a place called shadow trailers......
https://www.shadowtrailer.com/store/...iving-quarters
now if you don't need a separate garage there are 3 manufacturers on the west coast that have models built by offroaders for offroaders with nation wide warranty coverage. built better than any indiana toyhauler imo.
genesis
https://youtu.be/b6X4G1GOnLY
attitude by eclispe there models have a flip up floor on the slide out to by another 10" of floor space when the slide is in for the toys!
https://youtu.be/zAHIILlaXIE
attitude by eclipse with very nice kitchen
https://youtu.be/6R5sG_CObzs
genesis supreme
https://youtu.be/bFKezkVnAUc
pacific coach
https://youtu.be/sAFn3Ryjlzs
hope this info helps.