About to purchase first toy hauler, interior height concerns

Many toy haulers are not suitable for 1/2t trucks because of the large weight bias on the hitch (many are over 1000 lbs HW). You may find the only way you will be able to stay under rear axle rating is by not hauling water even with a weight distribution hitch. The lower weight capacity of the semi floating axle is your limitation. Once you step up to the 3/4t or larger class of trucks, most of the axles are full floating and designed for 9k lbs (even though they be lower rated due to the suspension or wheels).