Recommendations for quality budget trailers

Define "quality". There isn't much quality in the RV industry, let alone quality and budget in the same sentence. Just pick a floor plan you like from one of the better brands (not thor) and start there. Compare the same floorplan across different manufacturers and you'll start to get a feel for who has the better quality. Look for things that aren't obvious, like plumbing - do they use all pex or flexible fittings on fixtures, type of roof, how are the seams and penetrations treated, solid surface countertops or veneer particle board, etc.