Driving (gast) safety for older campers

We (small patchwork family with two children, 6 and 7) are currently looking for an affordable (<13000 Euro) camper for entry. Due to our children we have recently noticed with view of a Knaus 630 (EZ.92) that models up to about EZ.95 are almost never equipped with three-point belts for the passengers on the rear rows!?? What we need is a vehicle with - NOTES at least two THREE-PUNKTGURTEN - complete wet cell/kitchen, Truma-Hzg. - FE STEM rear bed (best with an outer storage compartment for table/chairs, etc.) - Alcoves for the children - middle seat group, which you don't have to constantly remodel - as sufficient as possible 95hp - besides the other rather minor gimmicks, such as awning, duomatic or satellite/TV and 4-wheel carrier... the following would be interesting for us now (as unfortunately we can't buy a new vehicle): ?? - Which rare model variants/manufacturers offer this and are recommended in this respect - What solutions have other families found that (up to year 95, for example) did not want to be satisfied with two-point belts? For example, retrofit solutions? ?? An admission of six seats for driving seemed surprisingly early despite missing / insufficient safety by belts to be no problem. We cannot reconcile this with our responsibility and now seem to be looking for the needle in the haystack. Who has to offer the appropriate also like to do by PM - we are grateful for every tip and every offer :-) Best regards Kirchner