Using a TT vs. a 5th wheel. Fivers tow solid, but you need enough truck to carry the hitch weight and truck bed storage is minimal.
RE TT : I understand using your trucks bed for storage, just buy enough truck to do the job you need to do . Loading equipment on a 1500 may cause you to be more limited when you add trailer tongue weight and people .
A 250/350 or 2500/3500 series might be a better option offering more payload, better rear axle and tire ratings, bearings, brakes etc .
Conventional TT (travel trailer) can work fine if set up correctly and you learn how to properly weigh your TV (tow vehicle) as well as your TT (hitched and unhitched) That will give you true weights of the trailer, the tongue weight , the weight on each TT axle and the weight on each axle of your TV . Knowing ALL your real rolling down the highway weights is the key to towing happiness.
It can all be weighed at one trip to a certified truck scale ( Cat Scales ) Just let the scale operator know what you want to do and you will charged accordingly. Its not expensive and the operator should be able to offer some help as to how to position the vehicles . There are many youtube video on how to weight a TT .
Know how to do it before you go to a scale.
http://www.rvuniversity.com/staticpages/index.php/Trailer_Sway_101https://www.etrailer.com/faq-weightdistribution.aspx