Welcome to the forum and it's very sad about the garage mishap.
I kinda agree with Gerry here. First, find out the GVWR of the trailer (check the RVIA sticker on the outside or inside one of the cabinet doors, or ask us where to look). Then multiply that number by .15 and then multiply once again by .25. This will give you the minimum and maximum estimates of how much weight you will put on the truck's rear axle. Then look for a truck that can handle the maximum weight you calculated plus a few hundred more pounds for gear, passengers, hitch and accessories you will put in the truck and add to that weight.
If you need more help on calculating this stuff, let us know and we can help out. If any part of the truck/trailer is overweight, or you don't know, then you are not compliant. If you weigh everything and know your numbers at all points of the weight, then you are fine.
A gasser that satisfies the weight ratings may be compliant but a diesel provides more ride comfort, strength and margin in the same truck. For example, you can put a gas engine in a particular Dodge truck, but if you put in a diesel, the weight ratings will be higher for the same truck. A diesel may also experience better mpgs over a gasser especially when towing. But if you have a lightweight 5th wheel, you might be okay with a gas engine. The gas engines are quieter, the fuel is cheaper (may be a tradeoff if the mpgs are lower) and the purchase cost may be less but you might not like how it struggles. Diesels are tougher, stronger and very durable. You must still ensure the weight ratings satisfy what you need. All trucks will be limited by more than the engine so knowing and meeting the ratings are important.
